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P1155 GMC Code - HO2S Lean Average Bank 2 Sensor 1

Quick Answer

The P1155 GMC code indicates a problem with the HO2S (Heated Oxygen Sensor) Lean Average Bank 2 Sensor 1 in the vehicle's engine. Common causes include Faulty HO2S, Vacuum leaks, Fuel system issues (such as a clogged fuel filter). 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
P1155 GMC indicates HO2S Lean Average Bank 2 Sensor 1.
Common causes
Common causes include Faulty HO2S, Vacuum leaks, Fuel system issues (such as a clogged fuel filter).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1155 GMC Description

The P1155 GMC code indicates a problem with the HO2S (Heated Oxygen Sensor) Lean Average Bank 2 Sensor 1 in the vehicle's engine. The HO2S is responsible for monitoring the oxygen levels in the exhaust gases, sending data to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. When the sensor detects that the air-fuel mixture is too lean (not enough fuel), it triggers the P1155 code.

OBDII Code P1155 GMC - HO2S Lean Average Bank 2 Sensor 1
P1155 GMC Code - HO2S Lean Average Bank 2 Sensor 1

Common Causes of P1155 GMC

  1. Faulty HO2S
  2. Vacuum leaks
  3. Fuel system issues (such as a clogged fuel filter)
  4. Exhaust leaks
  5. Problems with the ECM

Symptoms of P1155 GMC

  1. Poor engine performance
  2. Rough idling or stalling
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated
  5. Engine misfires

How to Fix P1155 GMC

  1. Diagnose the issue by using a scan tool to retrieve the trouble code and data from the HO2S sensor.
  2. Inspect the HO2S sensor and its wiring for any signs of damage or wear.
  3. Check for vacuum leaks and repair or replace any damaged hoses.
  4. Test the fuel system for proper pressure and flow, replacing the fuel filter if necessary.
  5. Clear the trouble code from the ECM and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1155 GMC

The typical repair costs for addressing a P1155 GMC code can vary depending on the specific cause of the issue. On average, you can expect to pay between $200 and $500 for parts and labor. However, as mentioned earlier, labor rates can vary significantly based on location, vehicle make and model, and the shop's hourly rate. It's recommended to consult with a local auto repair shop for a more accurate estimate.

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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.

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