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P1131 Diagnostic Trouble Code Discussion for March 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
2003 Ford Ranger Edge 3.0L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1FTYR44V13
P1131: bank 1 sensor 1- not switching fuel trim weak mixture. ... codes p1131-bank 1 sensor 1- not switching fuel trim weak mixture and p1151 bank 1 sensor 2- not switching fuel trim weak mixture. we know the truck is running very lean the fuel trim IS +50 for both banks, and all o2 se...
March 01, 2005
1997 Ford F-150 Lariat 4.6L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1FTDX1869V
P1131: Lack of HO2S B1S1 Sw Indicates lean. This Ford came in because of a complaint of rough idle and hesitating. With KOEO B1S1 O2 reads 1.67v all the others read .0 like they should. The vehicle does idle rough and seems underpowered. Driving the vehicle the other three O2 sensors are working fine bu...
March 16, 2005