P1131 Diagnostic Trouble Code Discussion for July 2009
Heated Oxygen Sensor (Bank 1 Sensor 1) Indicates A/F Ratio Too Lean
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| Help Request | Posted | |
| 1997 Mercury Mountaineer 5.0L Excessive Emissions VIN: 4M2DU55P4V P1131: o2/s b1s1 lean. Vehicle came in for failed emission test (IM240 Colorado). Fuel control looks good most of the time yet occasionally the front o2 sensor signals go to zero volts (both left and right sensors at the same time.) There seams to be a trend of doing this under a he... |
July 16, 2009 |
