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P0430 Diagnostic Trouble Code Discussion for March 2009

Catalyst System Low Efficiency (Bank 2)

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Trouble Ticket Help Requests for DTC P0430
Help Request Posted
2003 BMW 745Li 4.4L MIL Lamp on VIN: WBAGN63403
P0430: Cat Efficiency Bank 2. We have this BMW with a repeated cat efficiency problem. My trim readings are as follows at idle: STFT 1= -0.7 STFT 2= -0.7 LTFT 1= +9.4 LTFT 2= +9.4 In the freeze frame data which was taken at 60 MPH under a low load, the trims are very similar: STFT 1= +1.6...
March 19, 2009