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Re: code p0420 book says.catalyst system efficiency below Posted by Ari [Email] ![]() ![]() In Reply to: code p0420 book says.catalyst system efficiency below, fellow saaber, Wed, 3 Sep 2008 13:20:46 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The second O2 sensor - the one after the catalytic converter - is reading a signal out of limits. This could be the O2 sensor is bad, or the catalytic converter is bad. The second O2 sensor is there to make sure the cat is working (and the cat is there!).
Do you have any other trouble codes? What's the history on this car (year, model, engine would help). For example, if you knew the car had an ignition problem recently, that could indicate raw fuel got into the cat and ruined it. Or the cat is just tired. If there are other trouble codes, that could be the real problem, and the P0420 is just another symptom.
If there are no other codes, and you have no reason to suspect the cat has been damaged, you can try replacing the rear O2 sensor. "Universal" sensors are much cheaper than OEM, all you need to do is splice the wires (no big deal). After that, it may be time for a new catalytic converter. That's just a more expensive option. If there are other codes, follow them down first.
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