AutoCodes – Mercedes-Benz – P2273 Mercedes-Benz

P2273 Mercedes-Benz Code - O2 Sensor Signal Biased/Stuck Rich 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: P2273 Mercedes-Benz indicates O2 Sensor Signal Biased/Stuck Rich 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 4,777

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 P2273 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 P2273 Mercedes-Benz - O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2 - AutoCodes.com — P2273 Mercedes-Benz Code - O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P2273 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 P2273 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 = 0514 (Left O2 sensor, after TWC): Aging (P2273)

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2273 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 P2273 Mercedes-Benz code?

Need more information on how to fix the P2273 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 P2273 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P2273 in a Mercedes-Benz?

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

2. What does the OBDII code P2273 mean for a Mercedes-Benz?

- The code indicates that the O2 sensor signal for Bank 2 Sensor 2 is biased or stuck in a rich condition, causing the engine to run inefficiently.

3. What are the possible causes of OBDII code P2273 in a Mercedes-Benz?

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

4. How can I diagnose the O2 sensor for Bank 2 Sensor 2 in my Mercedes-Benz?

- Use a scan tool to monitor the O2 sensor's readings and voltage outputs. Check for any abnormalities that could indicate a biased or stuck rich signal.

5. Can I drive my Mercedes-Benz with OBDII code P2273?

- It is not recommended to drive the vehicle for an extended period with this code, as it can lead to decreased engine performance and potential damage over time.

6. How can I repair OBDII code P2273 in my Mercedes-Benz?

- Repair options include replacing the faulty O2 sensor, repairing any wiring issues, fixing vacuum or exhaust leaks, and addressing any fuel system problems.

7. Is resetting the Check Engine Light enough to fix OBDII code P2273 in a Mercedes-Benz?

- Resetting the light may temporarily clear the code, but it will not fix the underlying issue causing the rich signal from Bank 2 Sensor 2.

8. How much does it cost to repair OBDII code P2273 in a Mercedes-Benz?

- The cost of repair can vary depending on the exact cause of the code, but it may range from a few hundred dollars for a sensor replacement to more for complex issues.

9. Can a DIY enthusiast fix OBDII code P2273 in a Mercedes-Benz?

- Depending on the cause, some DIY enthusiasts may be able to address the issue themselves by replacing the O2 sensor or fixing minor wiring problems.

10. How often does OBDII code P2273 occur in Mercedes-Benz vehicles?

- While not extremely common, this code can occur in Mercedes-Benz vehicles with aging O2 sensors or underlying engine issues.