Question about 2003 Toyota Corolla

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The code PO420 came on for my 2000 Toyota Camray ......

Engine light appeared on dashboard, cat. was replaced by toyota, then engine warning light reappeared w/in a couple of days and I was told the same code, PO420 came on. Does this mean the new cat is not functioning properly? Or a sensor needs to be changed? Is the PO420 code for the cat only? Are both sensors usually replaced at the same time or generally not? Please reply. Also, how do I know the Toyota dealer carries and will install the correct, CA emissions part as opposed to the NY sensor part on a 2000 Toyota Camray w/ 67,000 mi?

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  • Anonymous Mar 19, 2014

    failed emissions one of three codes that popped up code po420,po442, and po113

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Catalyst Effeciancy below threshold (Bank 1) is the code meaning. Check or replace the oxygen sensors. Some cars have 2 .One is on the front of the cat. the other is the on the back. Check the back sensor . Other possible causes are leaking or damaged exhaust manifold, bad coolant temp sensor.If toyota did not replace both . replace the one on the back of the Caty.

Posted on Feb 02, 2009

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