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P1420 Diagnostic Trouble Code Discussion for April 2005

NOX Adsorptive Catalytic System Efficiency Too Low

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Trouble Ticket Help Requests for DTC P1420
Help Request Posted
1999 BMW 740iL 4.4L MIL Lamp on VIN: WBAGH8330X
P1420: mfr controlled aux emission control. Not sure where to start on this one. My info is not real good. Any help would be great.
April 06, 2005