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P1128 Diagnostic Trouble Code Discussion for November 2004

Closed Loop Fueling Not Achieved - Bank 1


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Trouble Ticket Help Requests for DTC P1128
Help Request Posted
2000 Volkswagen Beetle GLS 2.0L MIL Lamp on VIN: 3VWCA21C8Y
P1128: long term fuel trim mult. Bank One System too lean. Vehicle has code P1128 again, without any symptoms. Scan test shows O2 working well. If you clear the code it is back in a couple of days. Customer does not notice running problems when the MIL comes on. VW claimed O2 was a problem item and it was very inexpen...
November 22, 2004
2000 Volkswagen Jetta GLS 2.0L MIL Lamp on VIN: 3VWSA29M1Y
P1128: Lean exhaust. ... damaged the engine. Another shop "rebuilt" the engine and then it came to me. Had multiple codes the first time and ran poor. I replaced the O2 sensor, ignition coil assembly because it only ran on 2 cylinders, replaced plug wires and the fuel pres...
November 26, 2004
2000 Volkswagen Beetle GLS 2.0L MIL Lamp on VIN: 3VWCA21C8Y
P1128: long term fuel trim mult. Bank One System too lean. Vehicle has code P1128 again, without any symptoms. Scan test shows O2 working well. If you clear the code it is back in a couple of days. Customer does not notice running problems when the MIL comes on. VW claimed O2 was a problem item and it was very inexpen...
November 29, 2004
2000 Volkswagen Beetle GLS 2.0L MIL Lamp on VIN: 3VWCA21C8Y
P1128: long term fuel trim mult. Bank One System too lean. Vehicle has code P1128 again, without any symptoms. Scan test shows O2 working well. If you clear the code it is back in a couple of days. Customer does not notice running problems when the MIL comes on. VW claimed O2 was a problem item and it was very inexpen...
November 22, 2004
2000 Volkswagen Jetta GLS 2.0L MIL Lamp on VIN: 3VWSA29M1Y
P1128: Lean exhaust. ... damaged the engine. Another shop "rebuilt" the engine and then it came to me. Had multiple codes the first time and ran poor. I replaced the O2 sensor, ignition coil assembly because it only ran on 2 cylinders, replaced plug wires and the fuel pres...
November 26, 2004
2000 Volkswagen Beetle GLS 2.0L MIL Lamp on VIN: 3VWCA21C8Y
P1128: long term fuel trim mult. Bank One System too lean. Vehicle has code P1128 again, without any symptoms. Scan test shows O2 working well. If you clear the code it is back in a couple of days. Customer does not notice running problems when the MIL comes on. VW claimed O2 was a problem item and it was very inexpen...
November 29, 2004