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P0473 Mercedes-Benz Code - Exhaust Pressure Sensor High

Quick Answer

The P0473 diagnostic trouble code for Mercedes-Benz vehicles indicates a problem with the exhaust pressure sensor reading higher than normal levels. Common causes include Faulty exhaust pressure sensor: The sensor itself may be malfunctioning, causing it to provide incorrect readings to the ECM, Wiring issues: Damaged or corroded wiring connecting the exhaust pressure sensor to the ECM can lead to communication errors and trigger the P0473 code, Exhaust system blockages: Obstructions in the exhaust system, such as a clogged catalytic converter or blocked exhaust pipes, can cause abnormal 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
P0473 Mercedes-Benz indicates Exhaust Pressure Sensor High.
Common causes
Common causes include Faulty exhaust pressure sensor: The sensor itself may be malfunctioning, causing it to provide incorrect readings to the ECM, Wiring issues: Damaged or corroded wiring connecting the exhaust pressure sensor to the ECM can lead to communication errors and trigger the P0473 code, Exhaust system blockages: Obstructions in the exhaust system, such as a clogged catalytic converter or blocked exhaust pipes, can cause abnormal 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 10, 2024
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Code P0473 Mercedes-Benz Description

The P0473 diagnostic trouble code for Mercedes-Benz vehicles indicates a problem with the exhaust pressure sensor reading higher than normal levels. The exhaust pressure sensor is a crucial component of the vehicle's emissions system, responsible for monitoring the pressure of the exhaust gases to ensure optimal engine performance and reduce harmful emissions. When the sensor detects abnormally high pressure, it can trigger the P0473 code, indicating a potential issue that needs attention.

OBDII Code P0473 Mercedes-Benz - Exhaust Pressure Sensor High
P0473 Mercedes-Benz Code - Exhaust Pressure Sensor High

Common Causes of P0473 Mercedes-Benz

  1. Faulty exhaust pressure sensor: The sensor itself may be malfunctioning, causing it to provide incorrect readings to the ECM.
  2. Wiring issues: Damaged or corroded wiring connecting the exhaust pressure sensor to the ECM can lead to communication errors and trigger the P0473 code.
  3. Exhaust system blockages: Obstructions in the exhaust system, such as a clogged catalytic converter or blocked exhaust pipes, can cause abnormal pressure readings.
  4. ECM malfunction: A problem with the engine control module can also lead to the P0473 code being triggered.

Symptoms of P0473 Mercedes-Benz

  1. Reduced engine power: The vehicle may experience a loss of power or acceleration due to incorrect pressure readings from the exhaust pressure sensor.
  2. Increased fuel consumption: A faulty sensor can cause the engine to run inefficiently, resulting in higher fuel consumption.
  3. Illuminated check engine light: The P0473 code will trigger the check engine light to alert the driver to a potential issue with the exhaust pressure sensor.
  4. Rough idle: The engine may idle roughly or inconsistently due to incorrect pressure readings affecting fuel delivery.

How to Fix P0473 Mercedes-Benz

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the P0473 code and perform a thorough inspection of the exhaust pressure sensor and related components.
  2. Replace the exhaust pressure sensor: If the sensor is found to be faulty, it should be replaced with a new, OEM-quality sensor to ensure accurate readings.
  3. Check wiring and connections: Inspect the wiring harness and connectors for any damage or corrosion, repairing or replacing as needed.
  4. Clear the code: After completing the repairs, clear the P0473 code from the ECM's memory using the diagnostic scanner to reset the check engine light.
  5. Test drive: Take the vehicle for a test drive to ensure that the repair has resolved the issue and that the check engine light does not reappear.

Cost to Fix P0473 Mercedes-Benz

The cost of repairing a P0473 code on a Mercedes-Benz vehicle can vary depending on the specific model and year of the vehicle, as well as the location and labor rates of the auto repair shop. In general, replacing the exhaust pressure sensor and addressing any related issues can range from $200 to $500, including parts and labor. Additional costs may apply if other components need to be replaced or if further diagnostics are required. It's recommended to obtain a detailed estimate from a qualified mechanic or dealership to determine the exact cost of repairs for this issue.

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.

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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 P0473 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0473 on a Mercedes-Benz related to the Exhaust Pressure Sensor High?

The common symptoms include decreased engine performance, reduced fuel efficiency, and potentially an illuminated Check Engine Light.

2. What are the possible causes of OBDII code P0473 on a Mercedes-Benz?

The code P0473 on a Mercedes-Benz typically indicates a fault with the exhaust pressure sensor, a wiring issue, or a problem with the sensor's circuit.

3. How can I diagnose the cause of OBDII code P0473 on my Mercedes-Benz?

To diagnose the cause of code P0473, it is recommended to perform a thorough inspection of the exhaust pressure sensor, check the wiring for any damage or loose connections, and use a diagnostic scanner to read the sensor's data.

4. Can I drive my Mercedes-Benz with OBDII code P0473 present?

It is not recommended to drive your Mercedes-Benz with OBDII code P0473 present, as it can lead to further damage to the engine or emissions system. It is best to address the issue promptly.

5. How do I repair OBDII code P0473 on my Mercedes-Benz?

Repairing OBDII code P0473 on a Mercedes-Benz often involves replacing the faulty exhaust pressure sensor, repairing any damaged wiring or connections, and clearing the trouble code with a diagnostic scanner.

6. Are there any DIY tips for troubleshooting OBDII code P0473 on a Mercedes-Benz?

While diagnosing and repairing OBDII code P0473 may require specialized tools and knowledge, you can start by checking the sensor's connections, inspecting the wiring for any visible issues, and ensuring the sensor is clean and free of debris.

7. Is it necessary to reset the ECU after repairing OBDII code P0473 on a Mercedes-Benz?

Yes, it is recommended to reset the ECU after repairing OBDII code P0473 on a Mercedes-Benz. This will clear the trouble code from the system and allow the vehicle to relearn any adjustments made during the repair process.

8. Can a faulty exhaust pressure sensor cause other issues in addition to triggering OBDII code P0473 on a Mercedes-Benz?

Yes, a faulty exhaust pressure sensor on a Mercedes-Benz can cause issues such as poor engine performance, increased emissions, and potential damage to other components if left unaddressed.

9. How much does it typically cost to repair OBDII code P0473 on a Mercedes-Benz at a dealership or repair shop?

The cost of repairing OBDII code P0473 on a Mercedes-Benz can vary depending on the extent of the issue, the labor rates of the shop, and the cost of parts. It is advisable to obtain quotes from different shops for comparison.

10. Can OBDII code P0473 on a Mercedes-Benz be prevented or avoided?

While some causes of OBDII code P0473 may be inevitable, regular maintenance, timely repairs, and addressing any related issues promptly can help prevent the recurrence of this code on your Mercedes-Benz.

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