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P1128 Diagnostic Trouble Code Discussion for September 2009

Closed Loop Fueling Not Achieved - Bank 1

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Trouble Ticket Help Requests for DTC P1128
Help Request Posted
2002 Audi A4 Quattro 1.8L MIL Lamp on, P1128 VIN: WAUDC68D11
P1128: B1 to lean. ... with a few codes, cylinder misfire,B1S2 heater malfunction, cylinder 3 misfire, B1 system to lean, MAF resistance to high. I cleared the codes after saving the initial scan data put the vehicle on the dyno, code came back for a bad O2 heater [...] right aw...
September 23, 2009
1997 Volkswagen Jetta GLS 2.0L MIL Lamp on VIN: 3VWTD81HXV
P1128: Long Term Fuel Trim Bank 1 System Too Lean. Cust says drivability issue was corrected with fuel pump replacement and I have driven car and notice the rough idle to be normal but code returned.
September 29, 2009