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P0420 Diagnostic Trouble Code Discussion for July 2019

Catalyst Efficiency Below Normal (Bank 1)


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Trouble Ticket Help Requests for DTC P0420
Help Request Posted
2013 Buick Encore 1.4L MIL Lamp on VIN: KL4CJHSB2D
P0420: Catalyst System Low Efficiency. Came in with code for B1S2 o2 and P0420. Rear converter had a rattle inside. Replaced parts according to codes. Any help with how to test to get repairs completed would be great. al
July 11, 2019