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Engine-Codes – GMC – P0133 GMC

P0133 GMC Code - HO2S Slow Response Bank 1 Sensor 1

Quick Answer

The P0133 GMC code indicates that there is a slow response from the oxygen sensor located in Bank 1 Sensor 1 of the vehicle. Common causes include Contaminated or dirty oxygen sensor, Faulty oxygen sensor wiring or connectors, Issues with the ECM. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0133 GMC indicates HO2S Slow Response Bank 1 Sensor 1.
Common causes
Common causes include Contaminated or dirty oxygen sensor, Faulty oxygen sensor wiring or connectors, Issues with the ECM.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0133 GMC Description

The P0133 GMC code indicates that there is a slow response from the oxygen sensor located in Bank 1 Sensor 1 of the vehicle. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and sending this information to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. A slow response from this sensor can lead to issues with fuel efficiency, emissions, and overall engine performance.

OBDII Code P0133 GMC - HO2S Slow Response Bank 1 Sensor 1
P0133 GMC Code - HO2S Slow Response Bank 1 Sensor 1

Common Causes of P0133 GMC

  1. Contaminated or dirty oxygen sensor
  2. Faulty oxygen sensor wiring or connectors
  3. Issues with the ECM
  4. Exhaust leaks near the oxygen sensor
  5. Fuel system problems

Symptoms of P0133 GMC

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Engine misfires
  4. Check Engine Light illuminated
  5. Failed emissions test

How to Fix P0133 GMC

  1. Begin by locating the Bank 1 Sensor 1 oxygen sensor in the vehicle's exhaust system.
  2. Inspect the sensor for any contamination or buildup and clean it if necessary.
  3. Check the wiring and connectors for any damage or corrosion and repair or replace as needed.
  4. Clear the diagnostic trouble codes from the ECM using a scan tool.
  5. Test drive the vehicle to ensure that the issue has been resolved and the Check Engine Light does not reappear.

Cost to Fix P0133 GMC

The typical repair costs for addressing a P0133 GMC code can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check local rates for a more accurate estimate. Keep in mind that rates at dealerships or in metropolitan areas may be higher, while independent shops often charge less for repairs.

What does this mean?

Tech Notes for P0133 GMC

Replacing the Front Heated Oxygen Sensors (HO2S) usually takes care of the problem

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Information for Specific GMC Models

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.

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