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An OBD11 fault code for Catalyst System Low Efficiency

7
votes
3answers
TL;DR: O2 sensor data, thermal measurements, and physical resonance tests all point to a failed Catalytic converter. Here's the back story. MIL illuminated with codes P0440, P0420, P0404. Around … some research, agreed that replacing the canister was the best response. Replaced the carbon canister, drive cycled, and MIL illuminated with only P0420. Progress. Symptoms now: P0420 code (read 3 …
asked Mar 10 '16 by bishop
7
votes
1answer
Working on diagnosing an evap/emission/fuel system problem on my Toyota 2003 Corolla. More on that in this question. On 3/2, I saw a mechanic use his handheld OBD to read a code P0420. On 3/12 … , the new code read is P0446. 3/16: After a reset drive cycle, the new code read is P0420. Have confirmed cat failure, so this code seems correct. …
asked Mar 15 '16 by bishop