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Engine-Codes – Audi – P0479 Audi

P0479 Audi Code - Exhaust Pressure Control Valve Intermittent

Quick Answer

The P0479 code for Audi vehicles indicates a problem with the Exhaust Pressure Control Valve (EPCV) that is intermittent. Common causes include Faulty Exhaust Pressure Control Valve, Wiring or electrical issues, Vacuum leaks in the EGR system. 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
P0479 Audi indicates Exhaust Pressure Control Valve Intermittent.
Common causes
Common causes include Faulty Exhaust Pressure Control Valve, Wiring or electrical issues, Vacuum leaks in the EGR system.
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 12, 2024
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Code P0479 Audi Description

The P0479 code for Audi vehicles indicates a problem with the Exhaust Pressure Control Valve (EPCV) that is intermittent. The EPCV is a crucial component of the exhaust system that helps regulate exhaust pressure to optimize engine performance and emissions. When this valve malfunctions or operates intermittently, it can lead to issues with engine performance, fuel efficiency, and emissions control.

OBDII Code P0479 Audi - Exhaust Pressure Control Valve Intermittent
P0479 Audi Code - Exhaust Pressure Control Valve Intermittent

Common Causes of P0479 Audi

  1. Faulty Exhaust Pressure Control Valve
  2. Wiring or electrical issues
  3. Vacuum leaks in the EGR system
  4. Carbon buildup in the EPCV
  5. Exhaust system leaks

Symptoms of P0479 Audi

  1. Decreased engine power
  2. Rough idling or stalling
  3. Decreased fuel efficiency
  4. Increased emissions output
  5. Check Engine Light illuminated

How to Fix P0479 Audi

  1. Diagnose the issue by using a scan tool to identify the specific problem with the EPCV.
  2. Inspect the EPCV and surrounding components for any visible damage or signs of wear.
  3. Test the EPCV for proper operation using a multimeter to check for continuity and voltage.
  4. Replace the faulty EPCV or repair any damaged wiring or connections as needed.
  5. Clear the diagnostic trouble codes, reset the vehicle's computer, and road test to ensure the issue has been resolved.

Cost to Fix P0479 Audi

The cost to repair a P0479 code for an Audi vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair cost for replacing the Exhaust Pressure Control Valve can range from $200 to $500, including parts and labor. Keep in mind that additional diagnostic time may be needed to pinpoint the exact cause of the problem, and labor rates at auto repair shops can fluctuate based on location and other factors. It's recommended to consult with a qualified mechanic to get an accurate estimate for your specific vehicle.

What does this mean?

Tech Notes for P0479 Audi

Check the Exhaust Back Pressure Valve (EBPV) butterfly valve is opening and closing freely and not sticking. If it seems to move freely you can then check the connector and circuit for the EBPV solenoid.

When is the Code Detected?

Problems with either the Exhaust Back Pressure (EBP) Device or the tube between the exhaust manifold and the EBP sensor can be detected during the exhaust back pressure step test, in which the Engine Control Module (ECM) commands and then measures a specific preprogrammed pressure and then measures time for pressure decay during the engine running test.

If the ECM detects an Exhaust Back Pressure (EBP), Engine Oil Temperature (EOT) or Intake Air Temperature (IAT) sensor fault it will disable the exhaust back pressure regulator.

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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 P0479 Audi Code

1. What are the common symptoms of OBDII code P0479 in an Audi related to the Exhaust Pressure Control Valve Intermittent?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and potential exhaust system malfunctions.

2. What are the possible causes of OBDII code P0479 in an Audi?

- The code P0479 in an Audi is typically triggered by issues with the exhaust pressure control valve, wiring problems, or faulty sensors.

3. How can I diagnose the Exhaust Pressure Control Valve Intermittent issue in my Audi?

- To diagnose the issue, you can use an OBDII scanner to read the trouble codes, visually inspect the valve and its wiring for any visible damage, and test the valve's functionality.

4. Can I continue driving my Audi with OBDII code P0479 triggered?

- It is not recommended to drive your Audi with the code P0479 triggered, as it can lead to further damage to the exhaust system and affect the overall performance of the vehicle.

5. How can I repair OBDII code P0479 related to the Exhaust Pressure Control Valve Intermittent in my Audi?

- Repairing the issue may involve replacing the exhaust pressure control valve, repairing or replacing damaged wiring, or resetting the fault codes after addressing any underlying problems.

6. Are there any common DIY solutions for fixing OBDII code P0479 in an Audi?

- While some simple wiring checks and resets can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for a proper diagnosis and repair of the issue.

7. How much does it typically cost to repair OBDII code P0479 in an Audi?

- The cost of repair can vary depending on the specific cause of the issue, but it can range from a few hundred to over a thousand dollars, including parts and labor.

8. What are the long-term effects of ignoring OBDII code P0479 in an Audi?

- Ignoring the code P0479 can lead to increased emissions, decreased fuel efficiency, potential damage to the catalytic converter, and overall engine performance issues.

9. Can a faulty Exhaust Pressure Control Valve cause other OBDII codes to trigger in an Audi?

- Yes, a faulty exhaust pressure control valve can cause other related codes to trigger, such as P0478 or P0480, as well as potentially affecting the overall exhaust system performance.

10. Is it possible for the OBDII code P0479 to be a false alarm in an Audi?

- While rare, false alarms can occur with OBDII codes, so it is recommended to have the system checked by a professional to confirm the issue before proceeding with any repairs.

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