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Definition of check engine code P1131:
BMW:
HO2S 2 Bank 2 Dynamic Test Failure
Chrysler/Dodge/Jeep:
Fuel Pressure Regulator Valve
Citroen/Peugeot:
Lack Of HO2S Switch - Sensor Indicates Lean
Daewoo:
FUEL CORR RESISTANCE MAL
Ford:
Lack Of HO2S Switch - Sensor Indicates Lean
GM:
Heated Oxygen Sensor (HO2S) Circuit Low Variance Bank 1 Sensor 2
Jaguar:
Lack of H02S-11 switch, sensor indicates lean
Land Rover:
Oxygen Sensor Engine Lean *Codes* A U
Lincoln:
Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 1
Mazda:
HO2S Bank 1 Sensor 1 Signal Below 0.45v (A/F Ratio Too Lean)
Mercedes:
H02S - 11 signal above 0.45v (A/F ratio too lean)
Mercury:
Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 1
Nissan:
Swirl Control Solenoid Valve
Oldsmobile:
Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 1
Saab:
O2S. Switch point - lean. Sensor 1
Volkswagen/Audi:
Bank2 - Sensor1 Internal Rsistance too High
Volvo:
Bank2 - Sensor1 Internal Rsistance too High
Subaru:
Front oxygen sensor circuit malfunction (short circuit)