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P1158 Buick Code - HO2S Bank 2 Sensor 2 Rich Or High Voltage

Quick Answer

The P1158 Buick code indicates that there is an issue with the HO2S (Heated Oxygen Sensor) located on Bank 2 Sensor 2 in the vehicle's exhaust system. Common causes include Faulty HO2S, Vacuum leak in the intake system, Malfunctioning fuel injector. 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
P1158 Buick indicates HO2S Bank 2 Sensor 2 Rich Or High Voltage.
Common causes
Common causes include Faulty HO2S, Vacuum leak in the intake system, Malfunctioning fuel injector.
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 P1158 Buick Description

The P1158 Buick code indicates that there is an issue with the HO2S (Heated Oxygen Sensor) located on Bank 2 Sensor 2 in the vehicle's exhaust system. Specifically, the code points to the sensor detecting a rich air-fuel mixture or high voltage in the exhaust gases. This can have significant implications for the vehicle's performance and emissions output.

OBDII Code P1158 Buick - HO2S Bank 2 Sensor 2 Rich Or High Voltage
P1158 Buick Code - HO2S Bank 2 Sensor 2 Rich Or High Voltage

Common Causes of P1158 Buick

  1. Faulty HO2S
  2. Vacuum leak in the intake system
  3. Malfunctioning fuel injector
  4. Clogged air filter
  5. Fuel delivery system issue

Symptoms of P1158 Buick

  1. Decreased fuel efficiency
  2. Rough or hesitant acceleration
  3. Check Engine Light illuminated
  4. Strong fuel odor from the exhaust
  5. Engine misfires

How to Fix P1158 Buick

  1. Scan the vehicle's ECM to confirm the P1158 code and identify the specific sensor location.
  2. Inspect the HO2S on Bank 2 Sensor 2 for any visible damage or contamination.
  3. Test the sensor's voltage output using a multimeter to determine if it is functioning correctly.
  4. Replace the HO2S if it is found to be faulty, ensuring proper installation and securing of the sensor.
  5. Clear the fault codes from the ECM and perform a test drive to verify that the issue has been resolved.

Cost to Fix P1158 Buick

The cost of repairing a P1158 Buick code can vary depending on the specific cause of the issue and the price of the replacement parts. On average, the cost of replacing a HO2S sensor can range from $150 to $300, with additional costs for labor averaging around $100 to $200. Keep in mind that diagnostic time and labor rates can vary based on location and the complexity of the repair, so it is advisable 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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