P0420 Diagnostic Trouble Code Discussion for August 2016
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2005 Volkswagen Passat GLS 1.8L Stall VIN: WVWDD63B15 P0420: Catalyst efficiency. Replaced cat for P0420. Customer complains that vehicle vibrates when coming to a stop. Verified that at times engine idles down very low (almost stalls) when coming to a stop. The strange thing is the engine seems to idle down (almost stall) when the brake i... |
August 03, 2016 | |
| 2001 Mazda 626 ES 2.0L MIL Lamp on VIN: 1YVGF22C71 P0420: Warm up catalyst efficiency below threshold. I feel kind of silly even asking this question, but in order to make the correct repair i have no choice. Anyway,this cat conv code is throwing me a curve because i'm not sure which converter is setting this code. This car has california emissions and it has 1... |
August 04, 2016 | |
| 2005 Volkswagen Passat GLS 1.8L Stall VIN: WVWDD63B15 P0420: Catalyst efficiency. Replaced cat for P0420. Customer complains that vehicle vibrates when coming to a stop. Verified that at times engine idles down very low (almost stalls) when coming to a stop. The strange thing is the engine seems to idle down (almost stall) when the brake i... |
August 04, 2016 |
