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P0430 Diagnostic Trouble Code Discussion for August 2007

Catalyst System Low Efficiency (Bank 2)

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Trouble Ticket Help Requests for DTC P0430
Help Request Posted
2003 GMC Sierra 1500 SLE 4.3L MIL Lamp on VIN: 1GTEC14X93
P0430: Catalyst System Low Efficiency (Bank 2). ... did an fuel inj service, the Ck Engine has been coming on with a code P0430, but the truck runs good etc, the customer is concerned about the light. Bank 1, oxygen sensor 2 seems to be slow to responding, but the code refers to bank 2.
August 06, 2007