P0420 Diagnostic Trouble Code Discussion for July 2019
Catalyst Efficiency Below Normal (Bank 1)
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| 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 |
