P0420 Diagnostic Trouble Code Discussion for September 2013
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2006 Volvo S40 2.4i 2.4L Excessive Emissions VIN: YV1MS38226 P0420: Catalytic Efficiency Bank1. Vehicle came in with a code P0420 Catalytic Efficiency Bank1. looking at Long and Short term fuel trims, found LTFT -10 and STFT around -1 to -0.8 never goes lean. Upon revving engine fuel trims get better and come back closer to 0 on LTFT. Almost like an vacu... |
September 16, 2013 | |
| 2006 Volvo S40 2.4i 2.4L Excessive Emissions VIN: YV1MS38226 P0420: Catalytic Efficiency Bank1. Vehicle came in with a code P0420 Catalytic Efficiency Bank1. looking at Long and Short term fuel trims, found LTFT -10 and STFT around -1 to -0.8 never goes lean. Upon revving engine fuel trims get better and come back closer to 0 on LTFT. Almost like an vacu... |
September 17, 2013 | |
| 1997 BMW Z3 Roadster 1.9L MIL Lamp on VIN: 4USCH7322V P0420: Catalyst efficiency. My question on this one is why do I never see 100% calculated load value? I know the fix will be to install a BMW cat. I inherited this job and the customer got involved with the manufacturer of the aftermarket cat. The manufacturers engineer insists that his ... |
September 18, 2013 | |
| 2009 Chevrolet Traverse LS 3.6L MIL Lamp on VIN: 1GNER13D69 ... came in with p2097, p2099, p0420, p0430. I cleared codes and drove it for a day. only codes p0420 and p0430 reset. I seen a couple of service messages/tsbs for these vehicles saying check for exhaust leaks, injector problem... |
September 19, 2013 |
