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Hi, I'm new to the forum and have a question regarding the check engine light. It has been on for some time now. I went for my emissions test and they saw the light, plug in the tester and stated there was a PO 420 code referring to the catalyst system. I went to the local Autozone and used there tester, which came up no codes. The light went off on the way home. Do I take it back for the emissions test (1st one failed) or could it be something else?
 

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They may have cleared the could when they had the scanner hooked up. Many times after clearing a code it may come back in a day or two or even a couple of weeks. Then again it might never come back.

Drive for a couple of days and if the check engine light doesnt come back you might be good to go, but seeing that P0420 is a cat problem you might need it replaced.


Check these threads out:

http://www.tundrasolutions.com/forums/1gen-tundra/189822-check-engine-light-damn-2/

http://www.tundrasolutions.com/forums/4runner/92162-p0420-p0430-codes-when-will-end/
 
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