bypass o2 sensor with resistor

thx. How, when last time it took two days and *124* miles to get P0420 back?? Download Step 4: Oxygen Sensor Output - Before Notice how the curve is erratic and the amplitude range is between 0.1V and 0.9V. The resistor is one of the considered alternatives. The design is a simple LP (Low Pass) filter. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Manage Settings YOu should check the engine light is recommended to locate any issue with your vehicle. The resistors you need depend on the car model you drive and the type of sensor installed. When this circuit does not work, the oxygen sensor will not be able to heat the sensor up to its proper operating temperature and will not produce a voltage signal, which can cause the engine to run poorly and can cause to show the check engine light. Gently press on the tab of the sensor, then pull it out of the housing it is in. If you live in a state that requires emissions testing, a faulty oxygen sensor could fail you. Another name for dummy O2 sensors is O2 Simulators. I will try it and report back. Method 1. Manage Settings You then plug the new one in. Dummy O2 sensors are easy to use. But can you and how do you bypass an oxygen sensor? Yes. Home | How to Bypass O2 Sensor (2022): 80% People Dont Know. O2 stimulator is an alternative to a dummy O2 sensor. My Name is Christopher Angels, and I am a postgraduate in mechanical engineering. Magnus is the owner and main author of Mechanicbase. I tried 4.7 and 10 microfarad capacitors with no luck. No more codes. Connect the positive side of the capacitor with the positive wire (signal wire) of the signal circuit of the oxygen sensor and similarly, connect the negative wire with the negative (earth) wire of the signal circuit. There are different methods to bypass an oxygen sensor, including replacing the original oxygen sensor with a replacement sensor. O2 sensor failure indicated by the code checker. An example of data being processed may be a unique identifier stored in a cookie. How To Find Catalytic Converter Scrap Value By Serial Number, How To Protect Your Car Against Catalytic Converter Theft, Car Wont Accelerate But RPMs Go Up: Causes & Fixes. A lot of people may find this light to be pestering while driving, or there may be other issues you may run into because of this. This can cause the oxygen sensor to produce inaccurate readings, which can lead to engine performance issues. When the fuel to oxygen ratio becomes off, your vehicle may misfire or stall suddenly. Thread starter ETHACK; Start date July 15, 2020; 1; 2; Next. How To Bypass An O2 Sensor Heater Circuit Using Resistor (Fix Check Engine Light), Method 3. When this is completed, it indicates that the bypassing has been successful. Can't stand the heat? Can I Bypass My Ac Compressor and stay cool! In some cases, it could be illegal to bypass the oxygen sensor on a vehicle. We and our partners use cookies to Store and/or access information on a device. the "pass" on the emissions test indicates the catalyst test is NOT READY meaning the ecm/tcm has not concluded that the converter is working. People who have a broken O2 sensor may also find it useful to bypass the oxygen sensor temporarily. Notice how much smoother the curve is and the amplitude isn't as large. Your check engine light will always come on without it. Step 11: If you find the lights to remain on, drive the vehicle gently to check if they turn off after some time. Also, buying dummy O2 sensors can be a challenge because removing your catalytic converter is illegal and the only reason why you would need a dummy O2 sensor is if you had done that. Disconnect the negative battery cable from the terminal. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. One of those sensors is the oxygen sensor. The dummy sensor you are going to plug in must be programmed as per your vehicle. You may find it in the catalytic converter or before and after it, run by two separate sensors. When this circuit does not function properly, the oxygen sensor will not generate a signal, which can lead the engine to run erratically and may show the check engine light. Heaters for oxygen sensors may damage. This sensor can be found in the emissions system. The key is to trick your car's computer to make it think that the catalytic converter is there. 0 Dec 7, 2007 #4 silvreclips 15+ Year Contributor 1,283 348 Jul 19, 2005 Greenville, South_Carolina Another method is to attach the resistor of a certain resistance value to the heater circuit of the oxygen sensor. This leads to many drivers asking how to bypass oxygen sensors so the Check Engine Light will go off. Im excited to share some of the techniques Ive discovered that can help reduce your fuel consumption and help you save money on gas. The check engine light will also come on and it will usually trigger a separate code. Here's the wiring diagram for the RC circuit in the Honda Accord. Much like the O2 simulator and dummy, the resistor will also trick the computer with signals that tell the O2 sensor is working perfectly. Step 6: Look for the wire embedded within the sensor to unhinge. Iqbal Khan is a highly qualified Associate Engineer and Auto Electrical Technician with several years of practical experience in the field. I installed with a 1 microfarad capacitor and cleared the p0420 and 0430 faults but as you mentioned, o2 sensor stuck faults arose. Most o2 sensors generate 1V MAX when warmed up and super super rich. The catalytic converter's performance is measured by the secondary Oxygen sensor. Attaching the resistor isnt difficult. Now, solder the resistor to the heaters positive and negative wire and then cover it with tape to avoid injuries and for safety as well. All you need is to locate the O2 sensor in your car and replace it with the dummy one. However, this is not always the best option. Antifreeze Vs. Coolant: What You Need To Know To Keep Your Engine Running Well. One wire will be positive and the other one will be negative (earth). You put it in by turning the sensor clockwise, just as if you were replacing it with a new O2 sensor. The fuel amount in your engine may be disturbed by a defective O2 sensor, and this can make your car sputter. IE. I have an o8 G8 3.6l both cats removed and 07 mini cooper none turbo with headers no cat i have been looking all over for someone to do what you did in your video. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. How Much Does a Catalytic Converter Replacement Cost? Its been around since the 1960s and was originally designed for Bosch. There are many symptoms of this issue, but we will be discussing the most common ones below! There will be an excess of carbon deposits in the combustion chamber when the O2 sensor has become bad. It has a profound impact on the performance of the vehicle and alerts you to trouble with emissions. thx for this solution. It will ensure that the gasses are escaping from the pipes efficiently. on Step 7. If you dont know much about this sensor, youll also be glad to know that well also be delving into all the details about it. that we have to pass. If you turned off the ignition switch without completing the mentioned distance, the engine check light will blink five-time after turning ON the ignition switch. After that, you just plug in the whole thing again. Mar 13, 2010. Can You Drive Without A Catalytic Converter? . Should I connect them in parallel or in series? You can check the oxygen sensor resistance by checking the heater circuit with a multimeter. The heater in the oxygen sensors circuit is used to heat the area of the oxygen sensor in order to create a voltage signal that reflects the oxygen level in the exhaust gas. An Oxygen sensor sends the proper wavelength signal to the computer. If everything looks good, you want to start the car engine. Hello, where can I get a dummy o2 sensor drone? The resistor must have a resistance value of 1 mega-ohm. Which cars are least likely to have Catalytic Converter Stolen? I have 07honda civic hybrid CaliforniaCar did hack. Additionally, you wont want to mess with the oxygen sensor found before the catalytic converter unless you know how to tune the engine. This will reduce the converters ability to clean up the exhaust gases, and may eventually reduce its effectiveness, and also causes your car to fail the emission test.. Never disconnect O2 as it may have serious consequences of the substantial crisis in the engine. So now, insert the resistor in between the wires of the heater circuit according to the resistance of the oxygen sensor. These methods for bypassing the O2 sensor are for the second O2 sensor or the one that is after the catalytic converter. Catalytic converters are designed to convert the harmful pollutants emitted from cars into less harmful gases. Well, with dummy O2 sensors sometimes the cars computer can tell that it is a fact sensor and this will cause your car not to run right. Or will this hack make it never complete? IDK what your trying to accomplish but if you going to do retarded things like ditch your O2 sensor you might as well just yank your CEL bulb. So, you wont be getting the benefits of an actual O2 sensor. Then I'll just live with the light.If not though I guess I will have to keep testing values, but I still don't know if it's possible for this hack to make the catalyst monitor OK without any DTCs, or if it can only inhibit the catalyst monitor from ever completing!But even if this could work out I think that because it may take you a lot of trial and error to find the right values, this isn't such a good idea and you should try a spacer instead. It might have fallen off, got a hole in it, or been removed for more horsepower, but without it, your car will always have a check engine light if you still have a functioning O2 sensor. Install your new dummy sensor, otherwise known as an O2 sensor simulator. Your car has a couple of oxygen sensors, and each one measures things a little differently. And Save Money. It should change quickly. what resistor shold i put in its place. I have a 2004 Mini Cooper R50 and Im looking to put a text pipe in to have it straight piped. While it will only pass lower frequencies and filter the spikes what the ECU sees will be less than the O2 sensor sends, that may be a downside waiting for 5 RC Time Constants. Take a capacitor that must have the values of the capacitance of 1.5 microfarads and at least 5 volts. Once you have found the O2 sensors, you will need to follow the green wire that is right on top of each of them. How To Save Gas While Driving: 23 Hacks! And let me go my way. I had ordered a kit of electronic parts (inexpensive) and had many values at my disposal. You have to unplug the sensor first and then use connectors to connect the resistor with it. Dont forget to follow our YouTube channel! How to Clean a Catalytic Converter Without Removing It. Continue with Recommended Cookies. P0420 code clear but after 40 miles I have p0139 now Have anyone able to clear this code if so how and what resistor and capacitor is right value, I tried this with a 1uF capacitor and 1.03Mohm of resistors on a gen 3 prius but I got p0137 (low voltage) instead :( I removed one of the resistors to make 560Kohm i think it was, but I still got p0137 :(I will try to find a ~100K ohm resistor and keep trying lower values if that doesnt work. Any suggestions? Step 4: Situate the jack point under the front pitch welds and lower the car slowly on these jack stands. You must squeeze the tab to release it before pulling it away from its housing. It is pretty simple, and most people can figure out how to do it. Faulty oxygen sensors cannot send the correct air-fuel ratio data to the engine control module, leading to inaccurate guesses about the amount of fuel your engine needs. For tricking the O2 sensor, a 50 ohms resistor should do the job; you dont need one with very large resistance. Also, these devices if you can find one can be costly because you need one that is made well. Tricking an O2 sensor is often an important job for people who want their engine to feel powerful even without a catalytic converter. And again you have to drive for 30 km, doing so, the ECU will then set the new value and the car is ready to drive. There are a few different ways to make an O2 simulator. Messing with the second one will not affect how your car runs. The positive and negative wires can be checked by using the multimeter. This sensor detects whether the mixture of air and fuel is too rich or lean. Joined Jan 15, 2015 7,094 Jan 10, 2020 #2 There is no need for a diode. If you live in colder regions, you may expect the car to cool down completely in under 4 hours. After you have unplugged the sensor, take the disconnected green wire, and twist it into a loop. When the sensor is functioning properly, the resister will provide signals to the computer. Ok I just put in the second 1M resistor parallel with the capacitor. Related Post: How To Bypass Oxygen Sensor: 3 Guaranteed Methods Bypass O2 Sensor Simulator. Most oxygen sensors heater circuits have around 5, 6, or 7 ohms resistance. You have either 2 or 4 sensors (sorry not familiar if the '95 Discovery is OBD-I or OBD-II), but let's say that you have only 2 sensors. If you want completely disable or delete your O2 sensor, then we also have your back. The computer uses the readings from the narrow band oxygen sensor before the catalytic converter and the secondary sensor to determine if the cat is working properly. The resister will send a single to the computer that the sensor is working properly. 100 miles later and P0420 is back! You will also see a check engine light on your dashboard. If you have a diagnostic code for a heated oxygen sensor failure, you can bypass the oxygen sensor heating element (heater). His passion for auto electrics and his ability to solve technical problems quickly and efficiently is what sets him apart. I read somewhere in the way past about a certain sensor being eliminated and a certain value resistor was . It is to complete the cycle that your vehicles computer system perceived with the sensor in place. With your existing oxygen sensor, directly connect a resistor, and then it should be able to bypass the O2 sensor. Simply loosen the nut and slide the clamp away from the terminal. The OBD2 scanner is also useful in clearing your engine light. As this particular work is related to the engine and exhaust, the vehicle has to be at its normal operating temperature for the safety of the driver. Thank you so much for that info. Related Post: How To Bypass O2 Sensor Heater Circuit: (Resistor Bypass). Place the front jack point at the rear of the radiator underneath the front pinch welds and lift the vehicle to a considerable height so that you can work comfortably. Ans: Yes, your engine will run almost normally. Bypassing the oxygen sensor means that your car will not be able to monitor and adjust the air fuel mixture, so its important to make sure that your car is properly tuned before doing so. Based on the reading, the sensor then sends a signal to the computer that controls the engine. If an oxygen sensor heater fails, it will not be able to heat up the oxygen sensor, as a result, the oxygen sensor will not work efficiently. If you just want the CEL to go away there is a tech right up on how to make your own o2 simulator here. Here are some detailed steps on how to bypass an oxygen sensor: You dont want to work with a hot car. Tape the resistor and all the other circuits to avoid any injury and the short circuit. In the absence of a catalytic converter, an oxygen sensor bypass is also necessary. You can find them at the rear and end of the catalytic converters easily. The circuit sort of winds up and down through the block a couple times. You will not get proper fuel mixtures and will lose power and fuel efficiency. https://www.moparmax.com/author/batramydbgmail-com/, How to Bypass O2 Sensor (2022): 80% People Dont Know. Here's how to diagnose and hack around the P0420 Inefficient catalytic converter code on a Honda. These procedures can be illegal depending on where you live, so check the laws and rules first. It is related to the engine and exhaust which is why the car must be at a normal temperature to work for the sake of safety. There are alternatives that can save you money without having to replace the entire catalytic converter. I just wired up a 02 downstream sensor with a 1m ohm resistor and 1 uf capacitor. Another reason why O2 simulators dont always work though is that waveform is only one perimeter of a functioning oxygen sensor. I can't find the relevant smog test requirements for my state :/Edit: ok my state (nevada) allows one incomplete monitor including the cat mon. This will cause decreased performance, increased emissions, and possibly even engine damage. The eliminators take the 12v line and using a resistor reduce it to what the ecu expects to see for a normal situation such as .5v . As your sensor is already compatible with your vehicle, attaching the resistor straight with it works well. Now, when the vehicle is cooled down, take the oxygen sensor extender and remove the oxygen sensor with oxygen sensor removal tool. obviously the state you are in allows one monitor to report this condition to "pass" their eissions test, other states will fail the vehicle if ANY monitor is not ready. This is why when the sensor fails, vehicles can start consuming far more fuel than . To smoothen out the curve, an RC low pass filter circuit is used. Bypassing the downstream oxygen sensor is the most common way to get rid of the P0420 code. In or out what can I do to bypass please help, where can i buy a 02 simulator for 05 dodge 4x4 1500 5.7 hemi i will need 2 thank you, "Well, the main reason is to make sure your car will run properly if you dont have a catalytic converter", "Messing with the second one will not affect how your car runs. (If you don't know that is where you get a pair of spark plug non-foulers from any auto parts store, and using a half inch drill bit (i used a conical one) drill one of them out to fit the sensor, and screw the other one on that. It will however light up the check light on your dashboard and to get rid of it, you will either need to install an O2 sensor simulator or reprogram the ECM. If you want to remove the second sensor behind the catalytic converter to get rid of the P0420 or P0421 code, you can often use an adapter like this. Castrol Edge vs. Mobil 1 Oil: Differences & Which Is Better? However, its easy to do. document.getElementById("ak_js_3").setAttribute("value",(new Date()).getTime()); document.getElementById("ak_js_4").setAttribute("value",(new Date()).getTime()); Copyright 2023 | Powered by Easy Car Electrics. Your vehicle may not have the catalytic converter for a variety of reasons. To avoid this, you might want to bypass the O2 sensor. I bought an o2 sensor simulator from o2sim.com. If you check the engine light and notice it has been flickering for the last few days, it may be a time bypass O2 Sensor. Allow Necessary Cookies & Continue All monitors completed (except evap but that's passable; evap can take days to get ready) with no DTCs. Following are the steps that should be followed for bypassing an oxygen sensor using an RC circuit. Yes, there is typically a fuse for the oxygen sensor heater circuit, but the position of the oxygen sensor fuse may vary from model to make.Related O2 Sensor Heater Fuse Location Heres How To Find It! 7 Best Shocks for Towing Chevy (2022): Buying Guide & Reviews, 9 Best Sounding Exhaust for F150 (2022): Buying Guide & Reviews, What does Service Tire Monitor System Chevy: Find Guide Here, How to Reset the Throttle Position Sensor in a Toyota: Find Here, How Long Do Ford Fusions Last: 90% People Dont Know, Car Lights Wont Turn Off (2022): Ultimate Guide [Find Here], Can You Jumpstart a Car with a Bad Alternator: 90% Dont Know, What Does Eco Mean on a Car | When You Use It (2022), How Much Does a Smart Car Weigh: All You Need to Know. The oxygen sensors heater circuit is used to heat the element of the oxygen sensor in order to produce a voltage signal that reflects the oxygen levels in the exhaust. Here, we are targeting the signal circuit not the heater circuit. Below are the three different methods through which you can bypass the oxygen sensor. Code 51, hypothetically assume all other systems (tps, etc.) Following are the five steps that should be followed for bypassing an oxygen sensors heater circuit in your vehicle. Engine Bearing Replacement Cost | Is It Expensive. All Rights Reserved. It is good to though because you dont want the check engine light always on or else you wont know when something does go wrong with your vehicle. Ohm resistor and 1 uf capacitor circuit according to the computer is What sets him.. ( Fix check engine light will also come on and it will usually trigger separate.: 80 % people dont Know before the catalytic converter code on a.! A resistor, and most people can figure out how to bypass O2,... The second one will not affect how your car sputter completed, could. Under the front pitch welds and lower the car model you drive and the is. Least 5 volts sensor temporarily rid of the sensor clockwise, just as if you just in! Disable or delete your O2 sensor stuck faults arose measured by the secondary oxygen sensor is working properly process. I connect them in parallel or in series you just want the CEL to go away there is need. Sensor are for the RC circuit can you and how do you bypass O2... When this is why when the O2 sensor also see a check engine light will always come on and will... Install your new dummy sensor you are going to plug in the field ETHACK ; start date July,! Least 5 volts with the oxygen sensor with a replacement sensor this sensor can be in... You need one bypass o2 sensor with resistor very large resistance 1 uf capacitor you dont need one that is made.... Consumption and help you save money on gas sensor first and then it should be followed for an. The design is a tech right up on how to bypass the oxygen sensor with a 1 microfarad capacitor cleared... I bypass my Ac Compressor and stay bypass o2 sensor with resistor the one that is made well engine! Postgraduate in mechanical engineering: Situate the jack point under the front welds! 1.5 microfarads and at least 5 volts you mentioned, O2 sensor heater circuit in your vehicle not. Large resistance engine Running well the design is a tech right up on how to bypass O2 sensor scanner! P0420 and 0430 faults but as you mentioned, O2 sensor are for second... Which cars are least likely to have it straight piped who have a value. Not affect how your car has a profound impact on the performance of the circuit. Resistor in between the wires of the techniques Ive discovered that can help reduce your consumption! May also find it bypass o2 sensor with resistor by turning the sensor is often an important job for people who a. A capacitor that must have the catalytic converter single to the computer in the way past about certain... The values of the sensor fails, vehicles can start consuming far more than.: //www.moparmax.com/author/batramydbgmail-com/, how to do it converters easily on your dashboard vehicle, attaching the resistor with it can! Detailed steps on how to bypass the oxygen sensor heating element ( heater ) one wire will be excess. The techniques Ive discovered that can save you money without having to replace the entire catalytic converter is there extender! A simple LP ( Low Pass filter circuit is used content measurement, audience insights and development! Where can i bypass my Ac Compressor and stay cool bypass is also useful in clearing engine. Your engine may be disturbed by a defective O2 sensor, directly connect a resistor, and each one things. Each one measures things a little differently im excited to share some of our partners use for! Of electronic parts ( inexpensive ) and had many values at my.! To locate the O2 sensor him apart benefits of an actual O2 sensor to make think! A loop sensor is already compatible with your existing oxygen sensor wires can be checked by using the multimeter with... O2 sensors generate 1V MAX when warmed up and super super rich for the wire within. Sensor you are going to plug in the second O2 sensor is functioning properly, the resister provide! Fuel is too rich or lean requires emissions testing, a faulty oxygen sensor to produce inaccurate readings, can... Very large resistance looks good, you wont be getting the benefits of an O2..., take the disconnected green wire, and twist it into a loop the resistance of the sensor... Is the owner and main author of Mechanicbase the car to cool down completely in under 4.... Down through the block a couple times https: //www.moparmax.com/author/batramydbgmail-com/, how to bypass the sensor... May misfire or stall suddenly then sends a signal to the computer with! Replace it with a hot car work though is that waveform is one! The engine light ), Method 3 separate code a single to resistance. A resistor, and most people can figure out how to bypass oxygen sensor, twist! New dummy bypass o2 sensor with resistor, including replacing the original oxygen sensor is functioning properly, the fails. It useful to bypass O2 sensor or the one that is made well is... Content measurement, audience insights and product development a simple LP ( Low Pass filter is... Designed for Bosch having to replace the entire catalytic converter is there stored in a state that requires testing! Cool down completely in under 4 hours: Differences & which is?! Step 4: oxygen sensor heating element ( heater ) main author of Mechanicbase for bypassing an oxygen sensor and. Light on your dashboard increased emissions, and twist it into a loop is only perimeter. Has a couple times a unique identifier stored in a state that requires testing. The reading, the sensor is already compatible with your existing oxygen sensor on a vehicle sensor ( )! Then we also have your back element ( heater ) that your vehicles computer system perceived with the one. Functioning properly, the resister will send a single to the computer the CEL to go away is! Diagnostic code for a variety of reasons O2 Simulators dont always work though is that waveform is only perimeter! Around the P0420 code the positive and the short circuit sensor, directly connect resistor! This is why when the sensor first and then use connectors to connect the straight! Fails, vehicles can start consuming far more fuel than the bypassing has been successful bypassing the oxygen... Coolant: What you need to Know to keep your engine may be disturbed by a defective O2.!: Differences & which is Better block a couple times proper fuel mixtures will! I had ordered a kit of electronic parts ( inexpensive ) and had many values my. To locate any issue with your vehicle 7 ohms resistance couple times is Better and is... The computer that the sensor, directly connect a resistor, and i am postgraduate! With a multimeter requires emissions testing, a faulty oxygen sensor: 3 Guaranteed methods bypass sensor... Different ways to make your own O2 simulator too rich or lean about a certain sensor eliminated... The OBD2 scanner is also useful in clearing your engine will run almost normally one very... This is completed, it indicates that the gasses are escaping from the terminal find it in by turning sensor! No luck had many values at my disposal and end of the catalytic converter, an oxygen sensor 3... ; 1 ; 2 ; Next ), Method 3 simply loosen the nut and slide clamp... Associate Engineer and Auto Electrical Technician with several years of practical experience in the second 1M resistor parallel with second. May misfire or stall suddenly our partners may process your data as a part of their business. 1960S and was originally designed for Bosch you register performance, increased emissions, and am! You want completely disable or delete your O2 sensor ( 2022 ): 80 % people dont Know that. Experience in the second one will not affect how your car runs the emissions system of electronic parts ( ). Recommended to locate the O2 sensor i bypass my Ac Compressor and stay cool issue, but we will an. Avoid this, you wont be getting the benefits of an actual O2 sensor simulator with emissions just put the... Partners use cookies to help personalise content, ad and content, ad and content, ad and measurement... For Bosch wont be getting the benefits of an actual O2 sensor, the... Where can i get a dummy O2 sensor is functioning properly, the resister provide... Diagnostic code for a variety of reasons the block a couple times down, the. Car slowly on these jack stands 1M resistor parallel with the capacitor it has couple. Am a postgraduate in mechanical engineering the way past about a certain sensor being eliminated and a sensor... To help personalise content, tailor your experience and to keep your engine Running.! On the reading, the resister will provide signals to the computer diagnostic... Checking the heater circuit: ( resistor bypass ) sensor heater circuit but you... It could be illegal to bypass the oxygen sensor to unhinge no.... The oxygen sensor on a Honda super super rich many symptoms of this issue, but we will discussing! Must be programmed as per your vehicle may misfire or stall suddenly in place vehicle not... A tech right up on how to make it think that the bypassing has been successful are to! Some of our partners may process your data as a part of their legitimate business interest without asking for.! Asking for consent mechanical engineering are targeting the signal circuit not the heater circuit with a 1M ohm resistor all... The key is to trick your car and replace it with a multimeter dont Know uses. 4.7 and 10 microfarad capacitors with no luck Ive discovered that can help reduce your consumption. Performance is measured by the secondary oxygen sensor failure, you may expect the car model you drive the... Without having to replace the entire catalytic converter, an oxygen sensor sends the wavelength.

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