P0420 Diagnostic Trouble Code Discussion for June 2017
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2005 Jeep Liberty Limited 3.7L MIL Lamp on VIN: 1J8GL58K35 P0420: Catalytic Converter Efficiency (Bank 1). ... monitoring O2 sensors, upstream fluctuate from 2.7-3.4 volts and change according to vacuum leak or added fuel (brake clean through vacuum hose). Rear O2's seem fixed at 3.3 on bank 1 and 2.8 volts on bank 2 and don't fluctuate like upstream's. Measured te... |
June 02, 2017 | |
| 2013 GMC Sierra 3500 HD SLE 6.6L MIL Lamp on VIN: 1GD422C89D ... with P0420 and P2463 codes, and reduced power mode. Was showing 72 grams of soot, so we sold cat and injector for def, and performed manual regen. Soot down to 47 now, but driving now resets cat 420 code. Of course then it soots up real quick and back into... |
June 20, 2017 |
