AutoCodes – Mercedes-Benz – P0158 Mercedes-Benz

P0158 Mercedes-Benz 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 Mercedes-Benz 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 6,369

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 Mercedes-Benz 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 Mercedes-Benz - O2 Sensor Circuit High Voltage Bank 2 Sensor 2 - AutoCodes.com — P0158 Mercedes-Benz Code - O2 Sensor Circuit High Voltage Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0158 Mercedes-Benz?

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 Mercedes-Benz?

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 Mercedes-Benz 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.

Need more information about the P0158 Mercedes-Benz code?

Need more information on how to fix the P0158 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0158 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

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 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0158 in a Mercedes-Benz?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine light.

2. What does the OBDII code P0158 "O2 Sensor Circuit High Voltage Bank 2 Sensor 2" mean for a Mercedes-Benz?

- This code indicates that the oxygen sensor located in Bank 2 Sensor 2 is reporting a voltage higher than normal to the engine control module.

3. What are the possible causes of O2 sensor circuit high voltage in Bank 2 Sensor 2 in a Mercedes-Benz?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, and issues with the engine control module.

4. How serious is the OBDII code P0158 in a Mercedes-Benz?

- While the vehicle may still be operational with this code, it is important to address it promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

5. How can I diagnose the cause of O2 sensor circuit high voltage in Bank 2 Sensor 2 in my Mercedes-Benz?

- Diagnosis typically involves inspecting the oxygen sensor, checking for damaged wiring, conducting voltage tests, and using a scan tool to monitor sensor data.

6. Can I drive my Mercedes-Benz with the OBDII code P0158 present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the underlying issue as soon as possible to avoid further complications.

7. How can I repair OBDII code P0158 in my Mercedes-Benz?

- Repair options may include replacing the oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, and resetting the engine control module.

8. Is it possible to reset the Check Engine light after fixing O2 sensor circuit high voltage in Bank 2 Sensor 2?

- Yes, once the underlying issue is addressed and repaired, the Check Engine light can be reset using an OBDII scan tool to clear the fault code.

9. How can regular maintenance help prevent O2 sensor circuit high voltage issues in a Mercedes-Benz?

- Regular maintenance, such as replacing oxygen sensors at recommended intervals, checking for exhaust leaks, and inspecting wiring, can help prevent OBDII code P0158 from occurring.

10. Should I seek professional help to diagnose and repair OBDII code P0158 in my Mercedes-Benz?

- While some DIY enthusiasts may be able to address this code, seeking assistance from a qualified mechanic or technician is recommended for accurate diagnosis and proper repair.