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P0430 Diagnostic Trouble Code Discussion for February 2010

Catalyst System Low Efficiency (Bank 2)

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Trouble Ticket Help Requests for DTC P0430
Help Request Posted
2004 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEC19TX2
P0430: Catalyst System Low Efficiency (Bank 2). ... next day light on and code p0420 is on. I drove it for about 20 minutes and rechecked and found p0430 in code. this truck has a slight stumble at idle so I think it is the maf sensor. Back pressure test normal on cats did a crank test on the smog tester an...
February 10, 2010
1996 Volvo 850 2.4L Excessive Emissions VIN: YV1LS5541T
P0430: front o2 sensor no signal. Car came in with a code po430 front o2 sensor no signal. replaced sensor, car is running very rich. The Ecm is seeing .2v o2 sensor voltage. However when back probed the sensor is at .9v. It looks like the sensor is grounded through the pcm. There dosent seem ...
February 22, 2010