AutoCodes – BMW – P0158 BMW

P0158 BMW Code - O2 Sensor Circuit High Voltage Bank 2 Sensor 2

Quick Answer

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection. 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: P0158 BMW indicates O2 Sensor Circuit High Voltage Bank 2 Sensor 2.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection.
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.

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Code Popularity 15,460

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0158 BMW Description

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

OBDII Code P0158 BMW - O2 Sensor Circuit High Voltage Bank 2 Sensor 2 - AutoCodes.com — P0158 BMW Code - O2 Sensor Circuit High Voltage Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0158 BMW?

Faulty Rear Heated Oxygen Sensor Bank 2
Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks
Exhaust gas leaks

How to Fix the DTC P0158 BMW?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Replacing the Rear Heated Oxygen Sensor Bank 2 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0158 BMW code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 P0158 BMW Code

1. What are common symptoms of OBDII code P0158 in a BMW?

- Common symptoms include poor fuel economy, rough idling, engine hesitation, and the illumination of the check engine light.

2. What does the O2 Sensor Circuit High Voltage Bank 2 Sensor 2 code mean in a BMW?

- This code indicates that the oxygen sensor located downstream of the catalytic converter on bank 2 is detecting a higher than normal voltage.

3. What are the possible causes of OBDII code P0158 in a BMW?

- Possible causes include a faulty oxygen sensor, wiring issues in the O2 sensor circuit, a vacuum leak, exhaust system leaks, or a problem with the engine's fuel delivery system.

4. How can I diagnose the O2 Sensor Circuit High Voltage Bank 2 Sensor 2 code in my BMW?

- Diagnosing this code usually involves using an OBDII scanner to read the code, checking the wiring and connections to the sensor, and testing the sensor itself with a multimeter.

5. Can I drive my BMW with OBDII code P0158?

- It is not recommended to drive your BMW with this code present, as it can lead to further damage to the engine or catalytic converter.

6. How do I repair OBDII code P0158 in my BMW?

- Repairing this code typically involves replacing the bank 2 sensor 2 oxygen sensor, addressing any wiring issues, and clearing the code with an OBDII scanner.

7. Is it possible to clean the O2 sensor to fix code P0158 in a BMW?

- Cleaning the oxygen sensor may temporarily alleviate the issue, but it is recommended to replace the sensor for a more permanent solution.

8. How much does it cost to fix OBDII code P0158 in a BMW?

- The cost of fixing this code can vary depending on the labor rates and parts prices, but it typically ranges from $200 to $400 for parts and labor.

9. Can a DIY enthusiast fix OBDII code P0158 in a BMW?

- While some DIY enthusiasts may have the skills to replace the oxygen sensor themselves, it is recommended to have a professional inspect and repair the issue to ensure proper diagnosis and repair.

10. Will resetting the check engine light clear OBDII code P0158 in my BMW?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the problem.