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2004 honda odyssey oxygen sensor location11/24/2023 ![]() If you can’t get a reading from your O2 sensors it means you need to replace the sensors. Checking your O2 sensors will tell you if you need new O2 sensors or a new catalytic converter. If they are working properly O2 sensor 1 should constantly fluctuate between 0.1V – 0.9V and O2 sensor 2 should be steady. Your exhaust system has two O2 sensors (oxygen sensors), one before the catalytic converter (O2 Sensor 1) and one after the catalytic converter (O2 Sensor 2). Tools Needed: FIXD Sensor Or Multimeter/Butane Torch Click here to get FIXD for just $19.99 for a limited time!ĭifficulty Level: Beginner (With FIXD) – Advanced (With Multimeter) With FIXD Premium, you can even call the FIXD Mechanic Hotline to get specific answers for your car’s problems. You’ll also be able to read live data from your car’s sensors to diagnose your problems. It tells you what it means, how serious it is, and potential fixes with diagnostic steps. With the pocket-sized FIXD Sensor and app, you’ll be able to instantly translate your check engine light into simple terms on your phone. If you need any help or expert advice you can call the FIXD Mechanic Hotline for free to get specific answers for your car’s problems.Ĭons: FIXD isn’t free, but it’s only $19.99 for the Sensor. Pros: With FIXD you’ll be able to scan your codes yourself. Not only will you pay for the parts, but you’ll have to pay for labor. Mechanics usually charge about $100 for a diagnosis, but they typically deduct this cost from your bill if you get them to fix the problem too.Ĭons: This is probably the most expensive option. Pros: A mechanic will be able to scan your car and will be able to figure out what is the root cause of your problems and fix it. If you want them to clear your check engine light, they might not be willing to do that for liability reasons. You’ll still have to go to a mechanic or figure that out for yourself. They will scan your car and let you know all of the codes on your car.Ĭons: The downside is they won’t tell you what is causing your error codes. ![]() Pros: The main benefit of this is that you get your answer for free. There are a few options for this: Get a scan at AutoZone The only way to know if you have other codes is to use an OBD2 scanner. If you replace your catalytic converter without fixing the root cause, your new catalytic converter will fail too. For instance, if a P0300 (cylinder misfire) or P0172 (too much fuel in air/fuel mixture) can cause a catalytic converter to fail. Before you fix anything related to P0420 make sure you don’t have any other error codes because they could be the cause of your P0420. (I'll have to clamp the wires while a friend turns the key to on.P0420 may not be your only code. I might check for voltage in the wires tomorrow, but I'm pretty sure I know what I'll get. I know that there is a relay that provides power to the O2 sensor but it also provides power to the other O2 sensor and a couple of other sensors. This leads me to believe that the problem is in the circuit away from the O2 sensor. This vehicle only has two O2 sensors and I verified that I had in fact replaced the one before the Cat. Googling the code, I've come to realize that the code is specifically for "Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)". I went home and double checked everything. I took it to Autozone to have them clear it to no avail. I purchased a Bosch direct fit and had it in without trouble. I had the check engine light come on and Autozone told me it was a P0135 and that I needed a new oxygen sensor. This is basically the same engine as a 1998 honda accord. Let me know if you have other questions or need help. If you have a diagnostic trouble code indicating an issue with an O2 sensor, let me know what it is and I can direct you better. ![]() Please keep in mind, it isn't normal for all of these to go bad at the same time. Disconnect the rear secondary HO2S4P connector (A), then remove the rear secondary HO2S (B). Disconnect the front secondary H02S 4P connector (A), then remove the front secondary HO2S (B).ġ. Pics 4 and 5 correlate with these directions.ġ. Disconnect the rear A/F sensor 6P connector (A), then remove the rear A/F sensor (B). Install the parts in the reverse order of removal.ġ. Disconnect the front A/F sensor 6P connector (A), then remove the A/F sensor (B).Ģ. O2 sensor socket wrench, Snap-on YA8875 or SWR2, or equivalent, commercially availableġ. The first set of directions and pictures 2 and 3 show how to replace sensor 1 for both the front and rear banks. Here are the directions specific to your vehicle. Here is a link that shows how one is replaced: Each bank of the engine (there are two banks) has two sensors. You have two upstream and two down stream.
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