This indicates that your left pre-catalytic converter Oxygen sensor is bad.
P1131 and P1113 are pre-cat sensors, Bank 1 & Bank 2 sensor 1. Please refer to the diagram in the link below.
http://forums.audiworld.com/s4/msgs/2770872.phtml
They are anywhere from $70-200+ dollars and should be changed in pairs.
Trouble code P1131 means: Lack Of HO2S11 Switches - Sensor Indicates Lean
Trouble code P1131 means: Lack Of HO2S11 Switches - Sensor Indicates Lean
Trouble code P1131 means: Lack Of HO2S11 Switches - Sensor Indicates Lean
Trouble code P1131 means: Lack Of HO2S11 Switches - Sensor Indicates Lean
Trouble code P1131 means: Lack Of HO2S11 Switches - Sensor Indicates Lean
The trouble code P1131 for a Ford Taurus indicates a problem with the air-fuel ratio sensor, specifically that the sensor is reporting a lean condition (too much air, not enough fuel) in the engine's exhaust. This can be caused by various issues, such as a vacuum leak, a malfunctioning fuel injector, or problems with the mass airflow sensor. Addressing the underlying cause is essential to ensure proper engine performance and efficiency. It's advisable to perform a thorough diagnostic to pinpoint the exact issue.
Trouble code P0125 means: Insufficient Coolant Temp For Closed Loop Fuel Control Trouble code P1131 means: Lack Of HO2S11 Switches - Sensor Indicates Lean
Trouble code P0401 means: Exhaust Gas Recirculation Malfunction
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Trouble code P0000 means: No Fault Found
Yes
Trouble code P1131 means: Lack Of HO2S11 Switches - Sensor Indicates Lean Trouble code P1132 means: Lack Of HO2S11 Switches - Sensor Indicates Rich