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Engine-Codes – Generic – P0471

P0471 Code - Exhaust Pressure Sensor Range/Performance

Quick Answer

The P0471 code indicates that there is an issue with the exhaust pressure sensor, specifically related to its range or performance. Common causes include Faulty exhaust pressure sensor, Wiring or connector issues, Exhaust system leaks. 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
P0471 indicates Exhaust Pressure Sensor Range/Performance.
Common causes
Common causes include Faulty exhaust pressure sensor, Wiring or connector issues, Exhaust system leaks.
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 08, 2024
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Code P0471 Description

The P0471 code indicates that there is an issue with the exhaust pressure sensor, specifically related to its range or performance. The exhaust pressure sensor is a crucial component of the vehicle's emissions system, responsible for measuring the pressure in the exhaust system and sending this data to the engine control module (ECM). This information is used by the ECM to optimize fuel delivery and emissions control.

OBDII Code P0471 - Exhaust Pressure Sensor Range/Performance
P0471 Code - Exhaust Pressure Sensor Range/Performance

Common Causes of P0471

  1. Faulty exhaust pressure sensor
  2. Wiring or connector issues
  3. Exhaust system leaks
  4. Clogged DPF (Diesel Particulate Filter)
  5. Exhaust backpressure

Symptoms of P0471

  1. Decreased fuel efficiency
  2. Loss of power
  3. Rough idling
  4. Stalling
  5. Check Engine Light illuminated

How to Fix P0471

  1. Diagnose the specific cause of the code by using a scan tool to read live data and pinpoint the issue.
  2. Inspect the exhaust pressure sensor, wiring, and connectors for any damage or corrosion. Replace as necessary.
  3. Check for exhaust system leaks and repair or replace any damaged components.
  4. Clean or replace the DPF if it is clogged.
  5. Perform a backpressure test to check for exhaust restrictions and address any issues found.

Cost to Fix P0471

The cost of repairing a P0471 code can vary depending on the specific cause of the issue. In general, the cost of replacing an exhaust pressure sensor can range from $100 to $300, including parts and labor. However, if additional repairs or replacements are needed, such as fixing exhaust system leaks or replacing the DPF, the cost could increase significantly. It is advisable to consult with a professional mechanic to get an accurate estimate based on the specific diagnosis of the issue. Labor rates at auto repair shops can vary, so it's essential to consider these factors when determining the overall repair cost.

What does this mean?

Tech Notes for P0471

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.

Need more information about the P0471 code?

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Code P0471 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.

Frequently Asked Questions about P0471 Code

1. What are common symptoms of OBDII code P0471 (Exhaust Pressure Sensor Range/Performance)?

- Common symptoms include decreased engine performance, reduced fuel efficiency, black smoke from the exhaust, and potential stalling or rough idling.

2. What are the possible causes of OBDII code P0471?

- The code P0471 can be triggered by a faulty exhaust pressure sensor, wiring issues, exhaust system leaks, clogged DPF (diesel particulate filter), or a malfunctioning PCM (powertrain control module).

3. How can I diagnose the underlying issue causing code P0471?

- To diagnose the issue, start by checking the exhaust pressure sensor and its wiring for any visible damage. Perform a thorough inspection of the exhaust system for leaks or blockages, and consider checking the DPF for any issues.

4. Can I drive my vehicle with OBDII code P0471 active?

- While it may be possible to drive the vehicle with code P0471 active, it is not recommended as it can lead to further damage and decreased performance. It's best to address the underlying issue promptly.

5. How is OBDII code P0471 typically repaired?

- Repairs for code P0471 may involve replacing the exhaust pressure sensor, repairing any damaged wiring, fixing exhaust system leaks, cleaning or replacing the DPF, or reprogramming the PCM if necessary.

6. Are there any DIY tips for fixing OBDII code P0471?

- DIY tips for addressing code P0471 include checking and cleaning the exhaust pressure sensor, inspecting and repairing any damaged wiring, and ensuring the exhaust system is free of leaks or blockages.

7. Can a malfunctioning DPF cause OBDII code P0471?

- Yes, a clogged or malfunctioning DPF can cause code P0471 to trigger as it affects the exhaust pressure readings. It's important to inspect the DPF as part of diagnosing and repairing this code.

8. Will code P0471 cause my vehicle to fail an emissions test?

- Yes, OBDII code P0471 can cause your vehicle to fail an emissions test due to the impact on exhaust system performance and emissions levels. It's essential to address this code before undergoing an emissions test.

9. Is it safe to ignore OBDII code P0471 if my vehicle seems to be running fine?

- Ignoring code P0471 is not recommended, even if your vehicle seems to be running fine. Addressing the underlying issue promptly can prevent further damage and ensure optimal engine performance.

10. How much can I expect to pay for repairs related to OBDII code P0471?

- The cost of repairs for code P0471 can vary depending on the specific issue causing the code, the labor rates in your area, and the cost of parts. It's advisable to consult a mechanic for a diagnosis and cost estimate.

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