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1996 Toyota V6 Avalon OBD2 Code P0420 Troubleshooting Guide

Model: 1996 V6 Avalon Fault Code: P1996 Posted: 2010-02-26 20:12

I own a 1996 Toyota Avalon with a V6 engine, and I'm currently experiencing the P0420 diagnostic trouble code. I recently replaced the downstream oxygen sensor after the catalytic converter, and after resetting the system, the check engine light returned. The code persists despite the replacement. What should I do next? This is a common issue on older 1996 V6 Avalon models with catalytic converter-related emissions problems.

Related fault codes
P1996
Comments (1)
Anonymous 2010-03-01 14:02

Given the age of your 1996 Toyota Avalon, it's likely that the catalytic converter itself has degraded and needs replacement. A failing cat can cause a P0420 code even after replacing the oxygen sensor.