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P1131 Diagnostic Trouble Code Discussion for December 2005

Heated Oxygen Sensor (Bank 1 Sensor 1) Indicates A/F Ratio Too Lean

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Trouble Ticket Help Requests for DTC P1131
Help Request Posted
1998 Mercury Mountaineer 4.0L Poor Idle Quality, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on VIN: 4M2ZU54E4W
P1131: lack of HO2s B1S1 indicates lean. The truck sat for 2 years after it was hit in the D/S front then it was fixed and it was running bad and not wanting to idle the body shop replaced the spark plugs and wires. I then got the truck it had mis fire code for every cylinder and the Po171 and P0174,...
December 06, 2005
2002 Ford Explorer XLS 4.0L MIL Lamp on VIN: 1FMZU64EO2
P1131: o2B1S1 not switching or biased lean. Hello all! Vehicle came in with a code P1131, indicating lean or sensor not switching. When first looked at, freeze frame indicated fuel trims correcting for "rich" condition, not lean. Did notice that 02 sensor took several minutes to switch normally...
December 09, 2005
2002 Ford F-150 XL 4.2L MIL Lamp on VIN: 3FTRF17222
vehicle came in with check engine light on. po171 & po174 stored in memory. iac was at 52% really high. and baro pid was at 167hz. to high for this area. so we replaced the maf sensor and did an air induction service. baro pid was back to normal and iac ba...
December 20, 2005