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P0155 Chevrolet Code - HO2S Heater Performance Bank 2 Sensor 1

Quick Answer

The P0155 Chevrolet diagnostic trouble code indicates an issue with the HO2S (Heated Oxygen Sensor) heater performance on Bank 2 Sensor 1. Common causes include Faulty HO2S heater element, Wiring or electrical issues in the sensor circuit, Engine control module (ECM) malfunction. 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
P0155 Chevrolet indicates HO2S Heater Performance Bank 2 Sensor 1.
Common causes
Common causes include Faulty HO2S heater element, Wiring or electrical issues in the sensor circuit, Engine control module (ECM) malfunction.
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 Aug 25, 2024
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Code P0155 Chevrolet Description

The P0155 Chevrolet diagnostic trouble code indicates an issue with the HO2S (Heated Oxygen Sensor) heater performance on Bank 2 Sensor 1. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module to adjust the air-fuel mixture for optimal combustion. The heater element in the sensor helps it reach operating temperature quickly, improving accuracy and performance.

OBDII Code P0155 Chevrolet - HO2S Heater Performance Bank 2 Sensor 1
P0155 Chevrolet Code - HO2S Heater Performance Bank 2 Sensor 1

Common Causes of P0155 Chevrolet

  1. Faulty HO2S heater element
  2. Wiring or electrical issues in the sensor circuit
  3. Engine control module (ECM) malfunction
  4. Exhaust system leaks or damage
  5. Contamination of the sensor by oil or coolant

Symptoms of P0155 Chevrolet

  1. Check Engine Light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Rough idle or misfiring engine
  4. Failed emissions test
  5. Poor acceleration or hesitation during acceleration

How to Fix P0155 Chevrolet

  1. Diagnose the issue using a scan tool to confirm the P0155 code and inspect the HO2S heater on Bank 2 Sensor 1.
  2. Check the wiring and connections for any damage or corrosion, repairing or replacing as necessary.
  3. Test the heater element in the sensor to ensure it is functioning properly, replacing the sensor if it is faulty.
  4. Clear the code from the ECM memory and perform a road test to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the exhaust system or ECM.

Cost to Fix P0155 Chevrolet

The typical repair costs for addressing a P0155 Chevrolet code can range from $150 to $300, depending on the specific cause of the issue and the labor rates at the auto repair shop. Additional costs may be incurred if other components need to be replaced or if further diagnostics are needed. It's advisable to consult with a trusted mechanic or service center to get an accurate estimate based on the vehicle's make and model.

What does this mean?

Tech Notes for P0155 Chevrolet

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.
1998 Chevy Tahoe Check Engine Light & Code P0155




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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 P0155 Chevrolet Code

1. What does the OBDII code P0155 Chevrolet indicate?

The code P0155 indicates a problem with the HO2S (Heated Oxygen Sensor) heater performance on Bank 2 Sensor 1 in a Chevrolet vehicle.

2. What are the common symptoms of a P0155 Chevrolet code?

Common symptoms of a P0155 code include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.

3. What are the possible causes of a P0155 Chevrolet code?

Possible causes of a P0155 code include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or issues with the engine control module (ECM).

4. How can I diagnose a P0155 Chevrolet code?

Diagnosing a P0155 code involves checking the oxygen sensor's heater circuit for continuity, inspecting the sensor's wiring and connectors for damage, and testing the sensor's heater resistance.

5. Can I drive my Chevrolet with a P0155 code?

It is not recommended to drive your Chevrolet with a P0155 code, as it can lead to decreased fuel efficiency and potential damage to the engine over time.

6. How can I repair a P0155 Chevrolet code?

Repairing a P0155 code may involve replacing the faulty oxygen sensor, repairing damaged wiring or connectors, replacing blown fuses, or addressing any underlying ECM issues.

7. How much does it cost to fix a P0155 Chevrolet code?

The cost of fixing a P0155 code can vary depending on the exact cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

8. Can I reset the P0155 code on my Chevrolet without fixing the issue?

While you can clear the code using an OBDII scanner, it is important to address the underlying problem causing the P0155 code to prevent further issues with your vehicle.

9. How long does it take to repair a P0155 Chevrolet code?

The repair time for a P0155 code can vary depending on the exact cause of the issue and the expertise of the mechanic, but it typically takes around 1-2 hours to complete.

10. Are there any preventative measures to avoid a P0155 Chevrolet code?

To prevent a P0155 code, it is recommended to perform regular maintenance on your vehicle, such as checking and replacing oxygen sensors as needed, and addressing any engine performance issues promptly.

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