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P0420 Diagnostic Trouble Code Discussion for July 2022

Catalyst Efficiency Below Normal (Bank 1)


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Trouble Ticket Help Requests for DTC P0420
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