P1132 - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?
Possible causes
- 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)
  What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1132 Description

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.

P1132 Information for specific makes
P1132 AUDI HO2S Heater Circuit Bank 1/2 Sensor 1 Short To B+
P1132 BMW O2 Sensor Heater Control Circuit Bank 1 Sensor 1
P1132 BUICK H02S Circuit Low Variance Bank 2 Sensor 1
P1132 CADILLAC H02S Circuit Low Variance Bank 2 Sensor 1
P1132 CHEVROLET HO2S Circuit Low Variance Bank 2 Sensor 1
P1132 FORD Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 1
P1132 GMC HO2S Circuit Low Variance Bank 2 Sensor 1
P1132 INFINITI Swirl Control Valve Circuit
P1132 LINCOLN Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 1
P1132 MAZDA HO2S11 Rich Condition
P1132 MERCURY Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 1
P1132 MINI O2 Sensor Heater Control Circuit Bank 1 Sensor 1
P1132 NISSAN Swirl Control Valve Circuit
P1132 PONTIAC H02S Circuit Low Variance Bank 2 Sensor 1
P1132 SATURN H02S Circuit Low Variance Bank 2 Sensor 1
P1132 SUBARU Front Oxygen Sensor Heater Circuit Low Input
P1132 SUZUKI O2 Sensor Circuit High Voltage
P1132 VOLKSWAGEN HO2S Heater Circuit Bank 1/2 Sensor 1 Short To B+
P1132 VOLVO Lack Of HO2S Switch
Related Information
Repair Importance Level: 3
 
1=Low 2=Medium 3=High  
Repair Difficulty Level: 2
 
1=Easy 2=Moderate 3=Hard  
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