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P1128 Diagnostic Trouble Code Discussion for January 2012

Closed Loop Fueling Not Achieved - Bank 1

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Trouble Ticket Help Requests for DTC P1128
Help Request Posted
2001 Volkswagen Beetle GLS 2.0L MIL Lamp on VIN: 3VWCT21CX1
P1128: fuel trim bank 1 mult system too lean. ... back with same two codes P1128,P1255. We have already changed the mass air flow sensor and the coolant temp sensor and vehicle still sets codes. No driveability issues and both sensors are working properly. We have also done fuel pressure test and smoke te...
January 13, 2012