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Engine-Codes – Generic – P0474

P0474 Code - Exhaust Pressure Sensor Intermittent

Quick Answer

The P0474 code indicates a problem with the exhaust pressure sensor, specifically an intermittent issue. Common causes include Faulty Sensor: The exhaust pressure sensor itself may be malfunctioning, leading to intermittent readings, Wiring Issues: Damaged or corroded wiring connections to the sensor can cause intermittent signal disruptions, Exhaust System Blockage: A blockage in the exhaust system can affect the pressure readings received by the sensor. 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 indicates Exhaust Pressure Sensor Intermittent.
Common causes
Common causes include Faulty Sensor: The exhaust pressure sensor itself may be malfunctioning, leading to intermittent readings, Wiring Issues: Damaged or corroded wiring connections to the sensor can cause intermittent signal disruptions, Exhaust System Blockage: A blockage in the exhaust system can affect the pressure readings received by the sensor.
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 Aug 19, 2024
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Code P0474 Description

The P0474 code indicates a problem with the exhaust pressure sensor, specifically an intermittent issue. The exhaust pressure sensor is responsible for monitoring the pressure in the exhaust system and providing feedback to the engine control module (ECM). This information is crucial for the proper operation of the exhaust gas recirculation (EGR) system and diesel particulate filter (DPF) regeneration process.

OBDII Code P0474 - Exhaust Pressure Sensor Intermittent
P0474 Code - Exhaust Pressure Sensor Intermittent

Common Causes of P0474

  1. Faulty Sensor: The exhaust pressure sensor itself may be malfunctioning, leading to intermittent readings.
  2. Wiring Issues: Damaged or corroded wiring connections to the sensor can cause intermittent signal disruptions.
  3. Exhaust System Blockage: A blockage in the exhaust system can affect the pressure readings received by the sensor.
  4. ECM Malfunction: A problem with the engine control module (ECM) can also cause intermittent issues with the exhaust pressure sensor.

Symptoms of P0474

  1. Check Engine Light: The most common symptom associated with the P0474 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Power: The vehicle may experience a loss of power or acceleration due to incorrect pressure readings from the exhaust pressure sensor.
  3. Poor Fuel Economy: An intermittent exhaust pressure sensor can lead to inefficient fuel combustion, resulting in decreased fuel efficiency.
  4. Rough Idle: The engine may idle erratically or roughly if the exhaust pressure sensor is not functioning properly.

How to Fix P0474

  1. Diagnostic Check: Start by using a diagnostic scanner to retrieve the specific trouble code (P0474) and confirm the issue with the exhaust pressure sensor.
  2. Sensor Replacement: Replace the faulty exhaust pressure sensor with a new, OEM-quality sensor.
  3. Check Wiring: Inspect the wiring harness connected to the sensor for any damage or corrosion, and repair or replace as needed.
  4. Clear Codes: After the repair is complete, clear the diagnostic trouble codes from the ECM and reset the check engine light.
  5. Test Drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the exhaust pressure sensor is providing accurate readings.

Cost to Fix P0474

The cost of repairing an intermittent exhaust pressure sensor can vary depending on the make and model of the vehicle, as well as the location and labor rates of the auto repair shop. On average, the parts for this repair may cost between $100 and $200, while labor costs can range from $100 to $300. Therefore, the total repair cost could be anywhere from $200 to $500. It's recommended to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your specific vehicle.

What does this mean?

Tech Notes for P0474

Replacing the exhaust back pressure usually takes care of the problem

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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Code P0474 Information for Specific Makes

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.

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