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P1155 Cadillac Code - HO2S Lean Average Bank 2 Sensor 1

Quick Answer

The P1155 code for a Cadillac indicates a problem with the HO2S (Heated Oxygen Sensor) Lean Average Bank 2 Sensor 1. Common causes include Vacuum leak, Faulty fuel injectors, 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 Cadillac indicates HO2S Lean Average Bank 2 Sensor 1.
Common causes
Common causes include Vacuum leak, Faulty fuel injectors, 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 Cadillac Description

The P1155 code for a Cadillac indicates a problem with the HO2S (Heated Oxygen Sensor) Lean Average Bank 2 Sensor 1. The Oxygen Sensor plays a crucial role in monitoring the air-fuel ratio in the engine and providing feedback to the engine control module (ECM) for optimal combustion. When this sensor detects that the air-fuel mixture is too lean (higher oxygen content), it triggers the P1155 code.

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

Common Causes of P1155 Cadillac

  1. Vacuum leak
  2. Faulty fuel injectors
  3. Clogged fuel filter
  4. Malfunctioning oxygen sensor
  5. Intake air leak

Symptoms of P1155 Cadillac

  1. Reduced fuel efficiency
  2. Engine misfires or hesitation
  3. Rough idling or stalling
  4. Increased emissions
  5. Check Engine Light illuminated

How to Fix P1155 Cadillac

  1. Diagnose the issue using a scan tool to pinpoint the exact cause of the lean condition.
  2. Inspect the oxygen sensor and replace if necessary.
  3. Check for vacuum leaks and repair or replace any damaged hoses.
  4. Test the fuel injectors and replace any faulty ones.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1155 Cadillac

The cost to repair a P1155 code on a Cadillac can vary depending on the specific cause of the issue. On average, the cost of replacing an oxygen sensor can range from $200 to $300, including parts and labor. However, if additional repairs are needed, such as fixing a vacuum leak or replacing fuel injectors, the total cost could increase. It's recommended to consult with a trusted mechanic or dealership to get an accurate estimate based on your vehicle's make and model. Keep in mind that labor rates can vary, so it's advisable to shop around for the best deal.

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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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