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1996 Toyota Tercel P0420 Fault: Fast Idle and Check Engine Light

Model: 1996 Toyota Tercel Fault Code: P0420 Posted: 2008-08-11 15:46

My 1996 Toyota Tercel has started idling significantly faster than normal, and a few days later the check engine light activated. After scanning the vehicle, I received a P0420 diagnostic code. I'm wondering if a faulty oxygen sensor or catalytic converter could be causing this abnormal idle behavior. Could the issue be related to the exhaust system or ECU calibration? Any insights or troubleshooting steps would be greatly appreciated.

Related fault codes
P0420
Comments (1)
Anonymous 2008-08-11 16:35

Welcome! Yes, a faulty oxygen sensor or catalytic converter can contribute to abnormal idle behavior and may trigger P0420. For more detailed information, refer to this guide: http://www.obd-codes.com/p0420. This code has been discussed extensively in our forums.