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P0472 Mercedes-Benz Code - Exhaust Pressure Sensor Low

Quick Answer

The P0472 code for Mercedes-Benz indicates a low signal from the exhaust pressure sensor. Common causes include Faulty Exhaust Pressure Sensor: The sensor itself may be defective or damaged, causing it to send incorrect signals to the ECM, Wiring Issues: Corrosion, damage, or loose connections in the wiring harness connecting the sensor to the ECM can disrupt signal transmission, Exhaust System Blockage: An obstruction in the exhaust system, such as a clogged catalytic converter or exhaust pipe, can affect pressure readings. 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
P0472 Mercedes-Benz indicates Exhaust Pressure Sensor Low.
Common causes
Common causes include Faulty Exhaust Pressure Sensor: The sensor itself may be defective or damaged, causing it to send incorrect signals to the ECM, Wiring Issues: Corrosion, damage, or loose connections in the wiring harness connecting the sensor to the ECM can disrupt signal transmission, Exhaust System Blockage: An obstruction in the exhaust system, such as a clogged catalytic converter or exhaust pipe, can affect pressure readings.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P0472 Mercedes-Benz Description

The P0472 code for Mercedes-Benz indicates a low signal from the exhaust pressure sensor. This sensor is responsible for monitoring the pressure in the exhaust system and providing feedback to the engine control module (ECM) to optimize fuel delivery and emissions. When the sensor detects a low pressure signal, it can affect the engine's performance, fuel efficiency, and emissions output.

OBDII Code P0472 Mercedes-Benz - Exhaust Pressure Sensor Low
P0472 Mercedes-Benz Code - Exhaust Pressure Sensor Low

Common Causes of P0472 Mercedes-Benz

  1. Faulty Exhaust Pressure Sensor: The sensor itself may be defective or damaged, causing it to send incorrect signals to the ECM.
  2. Wiring Issues: Corrosion, damage, or loose connections in the wiring harness connecting the sensor to the ECM can disrupt signal transmission.
  3. Exhaust System Blockage: An obstruction in the exhaust system, such as a clogged catalytic converter or exhaust pipe, can affect pressure readings.
  4. ECM Malfunction: A malfunctioning engine control module may not be properly interpreting the sensor's signals, leading to a P0472 code.
  5. Exhaust Gas Recirculation (EGR) Valve Stuck Open: A stuck-open EGR valve can disrupt exhaust pressure readings and trigger this code.

Symptoms of P0472 Mercedes-Benz

  1. Check Engine Light: The most common symptom associated with a P0472 code is the illumination of the check engine light on the dashboard.
  2. Reduced Power: The vehicle may experience a loss of power or acceleration due to incorrect fuel delivery based on inaccurate pressure readings.
  3. Poor Fuel Economy: A malfunctioning exhaust pressure sensor can lead to inefficient fuel combustion, resulting in decreased fuel efficiency.
  4. Rough Idle: The engine may idle roughly or inconsistently due to incorrect pressure readings affecting the air-fuel mixture.
  5. EGR System Malfunction: A low signal from the exhaust pressure sensor can impact the EGR system's operation, leading to increased emissions output.

How to Fix P0472 Mercedes-Benz

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the P0472 code and perform a thorough inspection of the exhaust pressure sensor, wiring, and related components.
  2. Replace the Exhaust Pressure Sensor: If the sensor is faulty, replace it with a new OEM or high-quality aftermarket sensor to ensure accurate pressure readings.
  3. Check Wiring and Connections: Inspect the wiring harness for any damage, corrosion, or loose connections, and repair or replace as needed.
  4. Clear Fault Codes: Once the sensor is replaced and any wiring issues are addressed, clear the fault codes from the ECM to reset the system.
  5. Test Drive and Monitor: Take the vehicle for a test drive to ensure the issue is resolved, and monitor for any recurring symptoms or fault codes.

Cost to Fix P0472 Mercedes-Benz

The typical repair costs for addressing a P0472 code in a Mercedes-Benz can range from $200 to $500, depending on the specific cause of the issue and the labor rates at the auto repair shop. Parts costs for an exhaust pressure sensor can vary, but expect to pay around $100 to $200 for the sensor itself. Labor rates at auto repair shops can vary widely, with hourly rates typically ranging from $80 to $150. It is advisable to check with local repair shops for a more accurate estimate based on your location and vehicle model.

When is the Code Detected?

An Exhaust Back Pressure (EBP) signal that is detected out of range (high or low) by the Engine Control Module (ECM) will cause the engine to ignore the EBP signal and disable exhaust back pressure operation.

Need more information about the P0472 Mercedes-Benz 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 P0472 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0472 in a Mercedes-Benz related to the Exhaust Pressure Sensor Low?

The common symptoms include reduced engine power, poor fuel efficiency, and potential illumination of the Check Engine Light.

2. What are the possible causes of the OBDII code P0472 in a Mercedes-Benz?

The code P0472 can be caused by a faulty exhaust pressure sensor, damaged wiring or connectors, a clogged DPF (Diesel Particulate Filter), or issues with the exhaust system.

3. How can I diagnose the OBDII code P0472 in my Mercedes-Benz?

Diagnosing the code involves using an OBDII scanner to read the code, inspecting the exhaust pressure sensor and related components, and checking for any visible signs of damage or clogs.

4. Can I continue driving my Mercedes-Benz with the OBDII code P0472 present?

It is not recommended to drive your vehicle with the code P0472 present, as it can lead to further engine damage and decreased performance over time.

5. How can I repair the OBDII code P0472 in my Mercedes-Benz?

Repairing the code may involve replacing the exhaust pressure sensor, repairing any damaged wiring or connectors, cleaning or replacing the DPF, or addressing any issues in the exhaust system.

6. Is it possible to reset the OBDII code P0472 in a Mercedes-Benz without fixing the underlying issue?

While you can clear the code temporarily using an OBDII scanner, it is important to address the underlying issue to prevent further damage and ensure proper vehicle performance.

7. Are there any preventive measures to avoid the OBDII code P0472 in a Mercedes-Benz?

Regular maintenance of the exhaust system, including timely replacement of the DPF and inspection of the exhaust pressure sensor, can help prevent the occurrence of the code P0472.

8. Can a DIY enthusiast fix the OBDII code P0472 in a Mercedes-Benz?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address the code P0472 by replacing the exhaust pressure sensor or cleaning the DPF. However, complex issues may require professional assistance.

9. How much does it typically cost to repair the OBDII code P0472 in a Mercedes-Benz?

The cost of repairing the code P0472 can vary depending on the extent of the issue, the parts needed, and whether you choose to DIY or seek professional help. It is advisable to obtain quotes from mechanics for an accurate estimate.

10. Will fixing the OBDII code P0472 improve the overall performance of my Mercedes-Benz?

Yes, addressing the code P0472 and restoring the proper functioning of the exhaust pressure sensor can help improve engine performance, fuel efficiency, and overall driving experience in your Mercedes-Benz.

Discuss the causes and fixes for P0472 Mercedes-Benz OBDII Code

Submit a New Comment

  • Hi Guys,

    Sorry to invade. I have a 2004 c220 cdi estate..

    The car drove really low and as in limp mode..would not want to pick up/kick down...just steady slow drive.

    Was getting the code P1400...replaced the EGR...no luck...

    replaced the air mass sensor...no luck...

    Now getting the codes P0472 EXHAUST PRESSURE SENSOR LOW, P0403 EXHAUST GAS RECIRCULATION CIRCUIT MALFUNCTION, P1400.

    Now not sure on how to fix it now. Any help or guidance would be appreciated.

    Reply to Comment