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Engine-Codes – Generic – P1158

P1158 Code - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Rich

Quick Answer

Diagnostic trouble code P1158 indicates a lack of heated oxygen sensor switches on Bank 2 Sensor 2, which indicates a rich air-fuel mixture in the exhaust. Common causes include Faulty oxygen sensor, Wiring issues, Exhaust leaks. 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 indicates Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Rich.
Common causes
Common causes include Faulty oxygen sensor, Wiring issues, Exhaust leaks.
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 07, 2024
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Code P1158 Description

Diagnostic trouble code P1158 indicates a lack of heated oxygen sensor switches on Bank 2 Sensor 2, which indicates a rich air-fuel mixture in the exhaust. The oxygen sensor is responsible for measuring the amount of oxygen in the exhaust gases and sending this information to the engine control module (ECM). This data is crucial for the ECM to adjust the air-fuel mixture for optimal combustion efficiency.

OBDII Code P1158 - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Rich
P1158 Code - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Rich

Common Causes of P1158

  1. Faulty oxygen sensor
  2. Wiring issues
  3. Exhaust leaks
  4. ECM malfunction
  5. Rich fuel mixture due to other engine problems

Symptoms of P1158

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Black smoke from the exhaust
  4. Check Engine Light illuminated
  5. Reduced engine power

How to Fix P1158

  1. Diagnose the issue using a scan tool to confirm the P1158 code and pinpoint the problem.
  2. Inspect the oxygen sensor wiring and connections for any damage or corrosion.
  3. Test the oxygen sensor using a multimeter to determine if it is functioning correctly.
  4. Replace the oxygen sensor if it is faulty, ensuring to use an OEM or high-quality replacement part.
  5. Clear the trouble code, reset the ECM, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1158

The cost of repairing a lack of heated oxygen sensor switches on Bank 2 Sensor 2 can vary depending on the cause of the issue and the specific vehicle. On average, the cost of replacing an oxygen sensor ranges from $200 to $400, including parts and labor. However, additional costs may apply if other components need to be replaced or if there are underlying issues that need to be addressed. It is recommended to consult with a qualified mechanic or auto repair shop for an accurate cost estimate based on your vehicle's make and model. Labor rates can vary, with most shops charging between $80 to $150 per hour.

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Code P1158 Information for Specific Makes

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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