AutoCodes – Mercedes-Benz – P2272 Mercedes-Benz

P2272 Mercedes-Benz Code - O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2

Quick Answer

This fault code is stored in the Engine Control Module (ECM) when an anomaly is detected with the oxygen sensor biased voltage. Common causes include Faulty Heated Exhaust Gas Oxygen Sensor, Heated Exhaust Gas Oxygen Sensor harness is open or shorted, Heated Exhaust Gas Oxygen Sensor circuit poor electrical connection. 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: P2272 Mercedes-Benz indicates O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2.
Common causes: Common causes include Faulty Heated Exhaust Gas Oxygen Sensor, Heated Exhaust Gas Oxygen Sensor harness is open or shorted, Heated Exhaust Gas Oxygen Sensor circuit poor electrical connection.
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.

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Code Popularity 6,919

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 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 P2272 Mercedes-Benz Description

This fault code is stored in the Engine Control Module (ECM) when an anomaly is detected with the oxygen sensor biased voltage. The control module will supply the oxygen sensor with a voltage, normally between 400 and 700 millivolts. Once the oxygen sensor's operating conditions have been met and the sensor is operating at normal temperature, the sensor will pull down the biased voltage indicating a lean mixture and pull up the biased voltage indicating a rich mixture. The control module can now enter closed loop control and adjust engine fuelling accordingly. The signal wire must be inspected for open circuit or short to ground/positive. A faulty sensor may not be able to alter the biased voltage, so sensor operating should also be tested.

OBDII Code P2272 Mercedes-Benz - O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2 - AutoCodes.com — P2272 Mercedes-Benz Code - O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P2272 Mercedes-Benz?

Faulty Heated Exhaust Gas Oxygen Sensor
Heated Exhaust Gas Oxygen Sensor harness is open or shorted
Heated Exhaust Gas Oxygen Sensor circuit poor electrical connection
Air Intake Leaking (Metered Side)
Fuel Pressure

How to Fix the DTC P2272 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 = 0513 (Left O2 sensor, after TWC): Aging (P2272)

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2272 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 P2272 Mercedes-Benz code?

Need more information on how to fix the P2272 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 P2272 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P2272 in a Mercedes-Benz?

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

2. What does the OBDII code P2272 in a Mercedes-Benz indicate?

- This code indicates that the O2 sensor signal for Bank 2 Sensor 2 is biased or stuck lean, meaning the sensor is not providing the expected feedback to the engine control module.

3. What are the possible causes of O2 sensor signal biased/stuck lean (P2272) in a Mercedes-Benz?

- Possible causes include a faulty O2 sensor, wiring issues, exhaust leaks, vacuum leaks, or a problem with the engine control module.

4. How can I diagnose the O2 sensor signal biased/stuck lean issue in Bank 2 Sensor 2 of my Mercedes-Benz?

- Diagnosing this issue typically involves using a scan tool to monitor O2 sensor data, inspecting the sensor and its wiring for damage, and checking for exhaust or vacuum leaks.

5. Can I drive my Mercedes-Benz with the OBDII code P2272 present?

- It is generally not recommended to drive with this code present, as it can lead to poor engine performance and potential damage if left unresolved.

6. How can I repair the O2 sensor signal biased/stuck lean issue on Bank 2 Sensor 2 in my Mercedes-Benz?

- Repair options may include replacing the faulty O2 sensor, repairing damaged wiring, fixing any leaks, or reprogramming the engine control module if needed.

7. Will resetting the Check Engine Light resolve the P2272 code in my Mercedes-Benz?

- Simply resetting the Check Engine Light may not resolve the underlying issue causing the P2272 code. It is recommended to diagnose and repair the root cause of the problem.

8. Are there any common mistakes to avoid when addressing the O2 sensor signal biased/stuck lean issue in a Mercedes-Benz?

- Common mistakes to avoid include neglecting to check for exhaust or vacuum leaks, assuming the O2 sensor is always the problem, and not thoroughly inspecting the wiring.

9. How urgent is it to address the OBDII code P2272 in a Mercedes-Benz?

- While you may still be able to drive the vehicle with this code present, it is important to address it promptly to prevent potential engine damage and ensure optimal performance.

10. Can a DIY enthusiast fix the O2 sensor signal biased/stuck lean issue in a Mercedes-Benz?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to address this issue by following proper diagnostic procedures and replacing components as needed.