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Diagnosing your vehicle can be tricky. If you use a scan tool to determine its underlying problems, you might come across a P0471 code. In this article, we’ll discuss what this code means and how you can troubleshoot it.

What Does the P0471 Code Mean?

Diagnostic trouble code (DTC) P0471 is defined as “Exhaust Pressure Sensor “A” Circuit Range/Performance.” This code applies to vehicles that have turbocharged engines.

A P0471 code might be triggered if your powertrain control module (PCM) receives an incorrect signal from the exhaust pressure sensor. The signal from the exhaust pressure sensor should match the vehicle’s intake manifold pressure or ambient air pressure to function normally. A P0471 code can be caused by an electrical or mechanical fault.

car engine check
A P0471 code can be logged if your PCM receives an incorrect signal from the exhaust pressure sensor.

The exhaust pressure sensor is an important part of your vehicle because it sends information to your PCM regarding the pressure in the exhaust manifold so that the module can better manage output devices, such as the EGR valve. A faulty exhaust pressure sensor can lead to poor performance and part failure, so you should address this problem as soon as possible.

Note: The definition of code P0471 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0471 Code?

Several factors can result in a P0471 code. Some of the possible causes of a P0471 code are the following.

  • Obstructed pressure tube or port
  • Leaks in the exhaust gas recirculation or air intake system
  • Failed exhaust  pressure sensor 
  • Circuit issues, such as a damaged wire or poor connection
  • Faulty PCM
car air intake system
Leaks in the air intake system can trigger code P0471.

What are the Common Symptoms of the P0471 Code?

A P0471 code might be accompanied by other exhaust pressure sensor codes like P0470, P0472, P0473, and P0474. However, if your PCM is only storing a P0471, you might notice the following symptoms in your vehicle.

How to Diagnose the P0471 Code

The diagnostic procedure for a P0471 code depends on your vehicle’s make and model. You’ll need to follow the recommended procedures for your vehicle to get an accurate assessment of its problem. You can use the following video to get an idea of what troubleshooting the code might involve.  However, if you don’t have the necessary skills and knowledge to diagnose your vehicle, you should probably ask a mechanic for help.

How to Fix the P0471 Code

Troubleshooting a P0471 code requires a certain level of auto repair skills and knowledge. We recommend researching your vehicle’s common problems and fixes before attempting any repairs. Some automakers have released technical service bulletins (TSB) for their vehicles. Reading these TSBs can help you save time on research.

There are plenty of OBD-II resources available to help you fix your vehicle. You can learn more about DTCs in Chilton repair manuals and sign up for ALLDATA’s single-vehicle subscription service to get detailed factory repair information. If you aren’t confident about your automotive repair skills, it’s best to consult a mechanic.

Keep in mind that not all vehicles are the same. What works to resolve a P0471 code in a Ford might not work for a Volkswagen. Make sure to follow the recommended repair and diagnostic procedures for your vehicle to avoid making mistakes.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

File Under : OBD-II Trouble Codes
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