AutoCodes – Pontiac – P1131 Pontiac

P1131 Pontiac Code - HO2S Circuit Low Variance Bank 1 Sensor 2

Quick Answer

A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. Common causes include Faulty Heated Exhaust Oxygen (HO2S) Sensor, Heated Exhaust Oxygen Sensor harness is open or shorted, Heated Exhaust Oxygen Sensor circuit poor electrical connection. 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: P1131 Pontiac indicates HO2S Circuit Low Variance Bank 1 Sensor 2.
Common causes: Common causes include Faulty Heated Exhaust Oxygen (HO2S) Sensor, Heated Exhaust Oxygen Sensor harness is open or shorted, Heated Exhaust Oxygen Sensor circuit poor electrical connection.
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 694

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 Jul 24, 2021

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1131 Pontiac Description

A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

OBDII Code P1131 Pontiac - HO2S Circuit Low Variance Bank 1 Sensor 2 - AutoCodes.com — P1131 Pontiac Code - HO2S Circuit Low Variance Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P1131 Pontiac?

Faulty Heated Exhaust Oxygen (HO2S) Sensor
Heated Exhaust Oxygen Sensor harness is open or shorted
Heated Exhaust Oxygen Sensor circuit poor electrical connection

How to Fix the DTC P1131 Pontiac?

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 P1131 Pontiac 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.

Need more information about the P1131 Pontiac code?

Need more information on how to fix the P1131 Pontiac code? Get Access to Factory Service Manuals

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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.

Frequently Asked Questions about P1131 Pontiac Code

1. What are the common symptoms of OBDII code P1131 on a Pontiac?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What does the OBDII code P1131 on a Pontiac mean?

- The code P1131 indicates that there is a low variance in the signal from the oxygen sensor (Bank 1 Sensor 2) in the HO2S circuit.

3. What are the possible causes of the P1131 code on a Pontiac?

- Potential causes include a faulty oxygen sensor, wiring issues in the HO2S circuit, a vacuum leak, exhaust system leaks, or a problem with the fuel system.

4. How can I diagnose the OBDII code P1131 on my Pontiac?

- Diagnosis typically involves using a scan tool to read the code, checking the oxygen sensor's wiring and connections, inspecting for exhaust leaks, and performing a fuel system analysis.

5. Can I continue driving my Pontiac with the P1131 code?

- It is not recommended to drive your Pontiac with the P1131 code unresolved, as it can lead to further damage to the engine and catalytic converter.

6. How do I repair the OBDII code P1131 on my Pontiac?

- Repairs may involve replacing the oxygen sensor (Bank 1 Sensor 2), repairing any damaged wiring, fixing vacuum or exhaust leaks, or addressing issues in the fuel system.

7. Is it possible to reset the Check Engine Light after fixing the P1131 code on a Pontiac?

- Yes, once the underlying issue causing the P1131 code is repaired, the Check Engine Light can be reset using a scan tool to clear the code.

8. Are there any preventive maintenance tips to avoid the P1131 code on my Pontiac?

- Regularly servicing your vehicle, checking for and repairing any exhaust leaks, and ensuring proper fuel system maintenance can help prevent the occurrence of the P1131 code.

9. How long does it typically take to repair the P1131 code on a Pontiac?

- The repair time can vary depending on the exact cause of the code, but it may take anywhere from a few hours to a day for diagnosis and repair.

10. Should I seek professional help to fix the P1131 code on my Pontiac?

- Due to the complexity of diagnosing and repairing the P1131 code, it is recommended to seek assistance from a qualified mechanic or dealership specializing in Pontiac vehicles.