P0420 Diagnostic Trouble Code Discussion for July 2022
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2008 Buick LaCrosse CX 3.8L MIL Lamp on VIN: 2G4WC58238 P0420: catalyst converter efficiency. Thanks in advance. code p0420 keep coming back after use three different cat and Oem oxygen sensors up and down stream.no exhaust leak. check from dealer recommend Oem converter. My last option is use Oem catalyst converter cost about $1800 included core c... |
July 14, 2022 |
