![]() O2 sensors generate voltage based on the oxygen DIFFERENCE between the outside air, and the exhaust gas stream. Catalytic converters DO NOT store oxygen, and furthermore, do not release oxygen when it's needed! You cannot "fool" the computer by applying voltage to the O2 sensor lead.ģ. O2 sensors are not a kind of temperature sensor that generates voltage.Ģ. Here are my responses to some myths I've seen and heard on websites and Youtube:ġ. P0420 Permanent Code is the ECU saying the "second" O2 sensor(s) after your first catalytic converter(s) are not sending the signals the computer expects in relation to the signals the first O2 sensor(s) located in the exhaust manifold, are sending. There seems to be a lot of fantasy and misinformation on the internet about this code P0420 and other emissions codes, and wrongful attribution of problems and cures so let's be clear about what this code is and why it appears. These counties are:Įl Dorado, Placer, Riverside, San Bernardino, San Diego, and Sonoma."įor posterity, and anyone who has a P0420 problem in the future: "There are six counties that require smog certifications within certain Zip Codes only. I'm in Santa Clara county, ie Silly Con valley. Here's the list that doesn't require bi-annual checkups. Once I'm through this, registering the car in another county.įor future reference I sifted through them all. Turns out theres a bunch of counties you don't even need smog. Keep it as it and try to get it fixed, but shit, no codes or anything to wtf do I do? Not sure if I should fail it and then ask for more time from the DMV, or In danger of having my car impounded if I get pulled over for any reason.Īnyone have a drive cycle specific to my vehicle? Or suggestions?Īt this point I haven't gone in for smog, so not a failure, My reg, though paid, is now almost 6 months overdue for lack of a smog cert, and I'm My 2002 C230 Catalyst Readiness Monitor won't go ready!
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