AutoCodes – Mercedes-Benz – P0474 Mercedes-Benz

P0474 Mercedes-Benz Code - Exhaust Pressure Sensor Intermittent

Quick Answer

The Exhaust Back Pressure (EBP) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the Engine Control Module (ECM), produces a linear analog voltage signal that indicates pressure. Common causes include Faulty Exhaust Back Pressure Sensor, Exhaust Back Pressure Sensor harness is open or shorted, Exhaust Back Pressure Sensor 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: P0474 Mercedes-Benz indicates Exhaust Pressure Sensor Intermittent.
Common causes: Common causes include Faulty Exhaust Back Pressure Sensor, Exhaust Back Pressure Sensor harness is open or shorted, Exhaust Back Pressure Sensor 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 2,864

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 23, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0474 Mercedes-Benz Description

The Exhaust Back Pressure (EBP) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the Engine Control Module (ECM), produces a linear analog voltage signal that indicates pressure.
The EBP sensor's primary function is to measure exhaust back pressure so that the ECM can control the exhaust back pressure regulator (EPR) when needed.

OBDII Code P0474 Mercedes-Benz - Exhaust Pressure Sensor Intermittent - AutoCodes.com — P0474 Mercedes-Benz Code - Exhaust Pressure Sensor Intermittent

What does this mean?

What are the Possible Causes of the DTC P0474 Mercedes-Benz?

Faulty Exhaust Back Pressure Sensor
Exhaust Back Pressure Sensor harness is open or shorted
Exhaust Back Pressure Sensor circuit poor electrical connection

How to Fix the DTC P0474 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0474 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 P0474 Mercedes-Benz code?

Need more information on how to fix the P0474 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0474 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

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 P0474 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0474 in a Mercedes-Benz related to the Exhaust Pressure Sensor Intermittent issue?

- Common symptoms include reduced engine power, decreased fuel efficiency, and potential black smoke coming from the exhaust.

2. What are the possible causes of the OBDII code P0474 in a Mercedes-Benz?

- The code P0474 typically indicates a problem with the exhaust pressure sensor or issues related to the sensor's wiring, such as a loose connection or damaged wires.

3. How can I diagnose the OBDII code P0474 in my Mercedes-Benz?

- To diagnose the issue, you can use an OBDII scanner to read the code and inspect the exhaust pressure sensor and its wiring for any visible damage or issues.

4. Can I continue driving my Mercedes-Benz with the OBDII code P0474 present?

- It is not recommended to continue driving with the code P0474 active, as it can lead to further damage to the engine and emission control system.

5. How can I repair the OBDII code P0474 related to the Exhaust Pressure Sensor Intermittent in my Mercedes-Benz?

- Repairing the code P0474 often involves replacing the exhaust pressure sensor or repairing any damaged wiring associated with the sensor.

6. Are there any DIY tips for fixing the OBDII code P0474 in a Mercedes-Benz?

- While some may attempt to replace the exhaust pressure sensor themselves, it is recommended to consult a qualified mechanic or technician for proper diagnosis and repair of the issue.

7. Will resetting the OBDII code P0474 in my Mercedes-Benz make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the code is not addressed, it is likely to reappear.

8. How crucial is it to address the OBDII code P0474 in a Mercedes-Benz promptly?

- It is important to address the code promptly to prevent potential damage to the engine and ensure optimal performance and fuel efficiency of the vehicle.

9. Can extreme weather conditions affect the occurrence of the OBDII code P0474 in a Mercedes-Benz?

- Extreme weather conditions can potentially impact the exhaust pressure sensor's performance and lead to the intermittent issue associated with the code P0474.

10. Is the OBDII code P0474 specific to Mercedes-Benz vehicles, or can it occur in other car makes?

- While the code P0474 is commonly associated with Mercedes-Benz vehicles, similar issues with exhaust pressure sensors can occur in other car makes as well.