P0471 Code - Exhaust Pressure Sensor Range/Performance
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
- P0471 indicates Exhaust Pressure Sensor Range/Performance.
- 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.
Code P0471 Description
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.
What are the Possible Causes of the DTC P0471?
- 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 P0471?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0471 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.
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Information for Specific Makes
- P0471 Audi — Exhaust Pressure Sensor Range/Performance
- P0471 Dodge — Exhaust Pressure Sensor Range/Performance
- P0471 Ford — Exhaust Pressure Sensor Range/Performance
- P0471 Mercedes-Benz — Exhaust Pressure Sensor Range/Performance
- P0471 Volkswagen — Exhaust Pressure Sensor Range/Performance
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.
Discuss the causes and fixes for P0471 OBDII Code
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