AutoCodes – Generic – P1132

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

Quick Answer

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. Common causes include Faulty Upstream Oxygen Sensor Bank 1, Fuel pressure high or low, MAF sensor dirty/defective. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1132 indicates Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 1.
Common causes: Common causes include Faulty Upstream Oxygen Sensor Bank 1, Fuel pressure high or low, MAF sensor dirty/defective.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 32,723

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 03, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code 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.

OBDII Code P1132 - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 1 - AutoCodes.com — P1132 Code - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 1

What does this mean?

What are the Possible Causes of the DTC P1132?

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)

How to Fix the DTC P1132?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1132 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.