P0420 Diagnostic Trouble Code Discussion for November 2022
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2008 Buick Lucerne CXL 3.8L MIL Lamp on VIN: 1G4HD57228 P0420: Catalytic efficiency. ... with a 3.8 that is kind of being a bugger. I'll start from the beginning in the order that all repairs were done and results after each repair. Costumer came in with a P0420 no other codes car running good and noticed it's got new coils and wires, ... |
November 28, 2022 |
