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P1128 Diagnostic Trouble Code Discussion for January 2008

Closed Loop Fueling Not Achieved - Bank 1

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Trouble Ticket Help Requests for DTC P1128
Help Request Posted
1999 Volkswagen Golf GTI 2.0L MIL Lamp on VIN: WVWDA31J6X
P1128: ltft lean. Has codes p0140 p0141 & p1128. Car has had light on for a while and not sure when each code set. Secondary 02 is stuck at .450 volts in closed loop at all rpms including snap throttle. Maf sensor at .298gs @ idle. leaning to replacing MAF and Both 02's, Bu...
January 24, 2008