P1131 Diagnostic Trouble Code Discussion for October 2012
Heated Oxygen Sensor (Bank 1 Sensor 1) Indicates A/F Ratio Too Lean
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| Help Request | Posted | |
| 2002 Ford F-150 XL 4.2L Surge, Poor Fuel Economy, MIL Lamp on VIN: 1FTRX07232 P1131: Bank 1 indicates lean. Vehicle came in running rough at times with lean codes. Customer had already installed new upsteam o2s, maf, iac valve and intake gaskets with new bolts/isolaters. STFT both banks max out to +33%, at idle and no change off idle(1500rpm+), indicating no vacuum ... |
October 17, 2012 |
