P0471 Technical Description
Exhaust Pressure Sensor Range/Performance
If you’re seeing the P0471 trouble code in your car, this guide is for you. We’ll cover what it means, its symptoms, causes, and how to fix it.
As an ASE-certified mechanic, I’ve fixed this issue countless times.
You’ll learn how to diagnose the problem, spot the symptoms early, and apply effective fixes to get your car back in top shape.
Let’s get started and sort this out.
Key Takeaways
- P0471 indicates an issue with the Exhaust Pressure Sensor Range/Performance.
- Common symptoms include the check engine light, poor engine performance, and rough idling.
- Causes can be a faulty sensor, damaged wiring, exhaust leaks, or a clogged exhaust system.
- To fix, inspect and possibly replace the sensor, check wiring and connectors, and examine the exhaust system.
- Clearing the code with an OBD-II scanner after repairs ensures the issue is resolved.
- Professional help may be needed if the ECM is faulty or if DIY repairs are unclear.
Table of ContentsShow
What Does P0471 Trouble Code Mean?
The P0471 trouble code indicates a problem with the Exhaust Pressure Sensor Range/Performance.
This sensor is crucial for monitoring the pressure in the exhaust system, which helps the engine control module (ECM) manage the engine’s performance and emissions.
When this code appears, it means the ECM has detected a signal from the exhaust pressure sensor that’s out of the expected range.
The sensor’s job is to provide accurate pressure readings so the ECM can adjust fuel delivery and ignition timing.
If the sensor’s readings are off, it can lead to a variety of issues, including poor engine performance and increased emissions.
Several things can trigger the P0471 code. These include a faulty exhaust pressure sensor, wiring issues such as frayed or corroded wires, or connectors that are loose or damaged.
Additionally, problems like exhaust leaks or a clogged exhaust system can also cause this code to pop up.
When your car’s ECM senses that the exhaust pressure sensor is not operating within its normal range, it sets the P0471 code and usually turns on the check engine light.
This is a warning to address the issue promptly to avoid further damage or performance issues.
Understanding the P0471 code is the first step in diagnosing and fixing the problem. By knowing what this code means, you can better identify the symptoms and root causes, which we’ll cover in the next sections.
In short, P0471 signals an issue with the exhaust pressure sensor that needs to be addressed to maintain your car’s performance and emission standards.
P0471 Trouble Code Symptoms
Here are the common symptoms you might notice when your car has a P0471 trouble code:
- Check engine light is on
- Poor engine performance
- Decreased fuel efficiency
- Rough idling
- Difficulty accelerating
- Increased exhaust emissions
- Unusual exhaust noises
P0471 Trouble Code Causes
These are the typical causes behind a P0471 trouble code:
- Faulty exhaust pressure sensor
- Damaged or corroded wiring
- Loose or damaged connectors
- Exhaust leaks
- Clogged exhaust system
- Faulty ECM
How To Fix A P0471 Trouble Code
To fix a P0471 trouble code, follow these steps to diagnose and repair the issue:
1. Check the Exhaust Pressure Sensor
Start by inspecting the exhaust pressure sensor for any visible damage. If the sensor appears damaged, replace it.
2. Inspect Wiring and Connectors
Look for frayed, corroded, or disconnected wires and connectors. Repair or replace any damaged wiring. Ensure all connectors are securely attached.
3. Test the Sensor Signal
Use a multimeter to check the sensor’s signal. Compare the readings with the manufacturer’s specifications. If the readings are outside the expected range, replace the sensor.
4. Examine the Exhaust System
Check for exhaust leaks or blockages. Pay attention to areas near the pressure sensor. Repair any leaks and clear any blockages to ensure proper exhaust flow.
5. Check the ECM
If all other components are in good condition, the problem might lie with the ECM. Have a professional test the ECM to determine if it needs reprogramming or replacement.
6. Clear the Code
After performing repairs, use an OBD-II scanner to clear the trouble code. Drive the vehicle to see if the code returns. If the check engine light stays off, the problem is resolved.
By systematically checking each component, you can pinpoint the cause of the P0471 code and make the necessary repairs. If you’re unsure at any step, consult a professional mechanic for assistance.
Conclusion
Now you know what the P0471 trouble code means and how to fix it.
Have you ever dealt with this issue before?
Drop a comment below with your experience or any questions you have!
