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P1128 Diagnostic Trouble Code Discussion for November 2017

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 1.8L MIL Lamp on VIN: 3VWCC21C11
P1128: Bank 1 mixture adaption mult. System too lean. Long term fuel trim value is only indicating a lean condition under part throttle load. The short term fuel trim values are normal under idle so does not indicate a vacuum leak. I have checked all vacuum lines and vacuum control diaphragms for leaks and none p...
November 14, 2017