AutoCodes – Buick – P1131 Buick

P1131 Buick 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 Buick 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 4,949

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

What does this mean?

What are the Possible Causes of the DTC P1131 Buick?

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 Buick?

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 Buick 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 Buick code?

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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.