AutoCodes – Mercedes-Benz – P0159 Mercedes-Benz

P0159 Mercedes-Benz Code - O2 Sensor Circuit Slow Response Bank 2 Sensor 2

Quick Answer

This fault code is stored in the engine control module when the oxygen sensor response time is not as expected. 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: P0159 Mercedes-Benz indicates O2 Sensor Circuit Slow Response 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 5,959

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 Sep 15, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0159 Mercedes-Benz Description

This fault code is stored in the engine control module when the oxygen sensor response time is not as expected. This condition occurs if the sensor has been contaminated or is suffering from ageing. The ECM expects a voltage shift within a specific time frame under transient conditions. The rise and fall time of the sensor is monitored for this.

OBDII Code P0159 Mercedes-Benz - O2 Sensor Circuit Slow Response Bank 2 Sensor 2 - AutoCodes.com — P0159 Mercedes-Benz Code - O2 Sensor Circuit Slow Response Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0159 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

How to Fix the DTC P0159 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

Mercedes Benz Code = 0521 (Left O2 sensor, after TWC): Aging (P0159)

Replacing the O2 Sensor 2 usually takes care of the problem

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0159 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 P0159 Mercedes-Benz code?

Need more information on how to fix the P0159 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P0159 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0159 in a Mercedes-Benz?

- Common symptoms may include poor fuel efficiency, rough idling, hesitation or stalling, and an illuminated check engine light.

2. What does the OBDII code P0159 for a Mercedes-Benz indicate?

- The code P0159 indicates that the oxygen sensor circuit for Bank 2 Sensor 2 is experiencing a slow response.

3. What are the possible causes of OBDII code P0159 in a Mercedes-Benz?

- Possible causes include a faulty oxygen sensor, issues with the wiring or connectors related to the sensor, exhaust leaks, or problems with the engine's air-fuel mixture.

4. How can I diagnose the O2 sensor circuit slow response in Bank 2 Sensor 2 for a Mercedes-Benz?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the oxygen sensor and its wiring for damage, and checking for any exhaust leaks.

5. Can I drive my Mercedes-Benz with OBDII code P0159?

- It is generally not recommended to drive your vehicle with an OBDII fault code present, as it can lead to potential issues with engine performance and emissions.

6. How can I repair OBDII code P0159 in a Mercedes-Benz?

- Repair typically involves replacing the oxygen sensor for Bank 2 Sensor 2, addressing any wiring or connector issues, and fixing any exhaust leaks if present.

7. Are there any DIY tips for fixing O2 sensor circuit slow response Bank 2 Sensor 2 in a Mercedes-Benz?

- While some may attempt to replace the oxygen sensor themselves, it is recommended to have a qualified mechanic diagnose and repair the issue to ensure proper installation and calibration.

8. How much does it cost to fix OBDII code P0159 in a Mercedes-Benz?

- The cost can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor to replace the oxygen sensor.

9. Will OBDII code P0159 cause my Mercedes-Benz to fail an emissions test?

- Yes, having an unresolved OBDII fault code like P0159 can cause your vehicle to fail an emissions test due to issues with the oxygen sensor circuit.

10. How can I prevent O2 sensor circuit slow response Bank 2 Sensor 2 issues in my Mercedes-Benz?

- Regular maintenance, such as keeping up with scheduled tune-ups and inspections, can help prevent issues with the oxygen sensor circuit and other related components.