P1131 - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
- Faulty Upstream Oxygen Sensor Bank 1
- Fuel pressure high or low
- MAF sensor dirty/defective
- Vacuum leak on engine
- Leaking fuel injector or fuel pressure regulator
- Faulty Powertrain Control Module (PCM)
- Engine Light ON (or Service Engine Soon Warning Light)
The Heated Oxygen Sensor (HO2S) Monitor is an on-board strategy designed to monitor the HO2S sensors for a malfunction or deterioration that can affect emissions. Under specific conditions, the fuel control or upstream HO2S sensors are checked for proper output voltage and response rate (the time it takes to switch from lean to rich or rich to lean). Downstream HO2S sensors used for Catalyst Monitor are also monitored for proper output voltage. Input is required from the Engine Coolant Temperature (ECT) or Cylinder Head Temperature (CHT), Inlet Air Temperature (IAT), Mass Air Flow (MAF), Throttle Position (TP) and Crankshaft Position (CKP) sensors to activate the HO2S Monitor. The Fuel System Monitor and Misfire Detection Monitor must also have completed successfully before the HO2S Monitor is enabled.
• The HO2S sensor senses the oxygen content in the exhaust flow and outputs a voltage between zero and 1.0 volt. Lean of stoichiometric (air/fuel ratio of approximately 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volt. Rich of stoichiometric, the HO2S will generate a voltage between 0.45 and 1.0 volt.
• The HO2S Monitor evaluates both the upstream (Fuel Control) and downstream (Catalyst Monitor) HO2S for proper function.
• Once the HO2S Monitor is enabled, the upstream HO2S signal voltage amplitude and response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum calibratable threshold voltage.
• A fixed frequency closed loop fuel control routine is executed and the upstream HO2S voltage amplitude and output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate.
• An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and by
measuring the current going through the heater circuit.
• The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.
P1131 Information for specific makes
P1131 BMW Oxygen Sensor Behind Catalytic Converter 2 Ageing
P1131 BUICK HO2S Circuit Low Variance Bank 1 Sensor 2
P1131 CADILLAC HO2S Circuit Low Variance Bank 1 Sensor 2
P1131 CHEVROLET HO2S Circuit Low Variance Bank 1 Sensor 2
P1131 CHRYSLER Glow Plug Control Module Internal Fault-Voltage Supply Concern
P1131 FORD Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
P1131 GMC HO2S Circuit Low Variance Bank 1 Sensor 2
P1131 HYUNDAI Injection Quantity Adjust
P1131 INFINITI Swirl Control Valve Control Solenoid Valve
P1131 LINCOLN Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
P1131 MAZDA Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 1
P1131 MERCURY Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
P1131 MINI Oxygen Sensor Behind Catalytic Converter 2 Ageing
P1131 NISSAN Swirl Control Valve Control Solenoid Valve
P1131 SUBARU Front Oxygen Sensor Circuit Malfunction Short Circuit
P1131 SUZUKI HO2S11 Circuit Low Voltage Shift/High Voltage
P1131 VOLKSWAGEN HO2S21 Inner Resistance Too Large