P0471 OBD-II Trouble Code: Exhaust Pressure Sensor Range/Performance

check engine light

P0471 code definition

The P0471 Trouble Code refers to the exhaust pressure sensor range/performance.

What the P0471 code means

If the P0471 code appears, it means that the powertrain control module has detected that there is a voltage reading from the exhaust system back pressure sensor circuit that is out of the normal range. This is generally monitored in turbocharged vehicles, and those vehicles that have diesel engines.

What causes the P0471 code?

A number of things could cause the P0417 code to appear, including the following:

  • Exhaust gas pressure sensor.
  • Something could be blocking the tube that runs from the exhaust manifold to the pressure sensor.
  • Issues with the exhaust gas recirculation system.
  • Potential issue with the powertrain control module, although this is quite rare.

What are the symptoms of the P0471 code?

If the code becomes stored, it could disable the exhaust back pressure regulator. In some vehicles, the driver might notice that there is diminished engine performance. The Check Engine Light will also light up, and you may find that other codes related to the exhaust system or the turbocharger could also be stored.

How does a mechanic diagnose the P0471 code?

The mechanic will make use of a device called an OBD-II scanner. This device will connect to the onboard computer, which has stored data about the vehicle. The mechanic can learn about all of the different codes that have been stored, and this will give them a better idea of how to approach the vehicle’s repair. They will also want to reset the codes. They will test the vehicle to see if they come back or not. If they do, then the mechanic knows that there is an actual problem with the vehicle.

Common mistakes when diagnosing the P0471 code

One of the common mistakes when technicians diagnose the P0471 code is believing that it is an exhaust gas recirculation code. It is important for the mechanic to diagnose the correct code and to follow through with the proper repairs. After they test and make repairs to different parts of the system, it is also a good idea for them to reset the codes and test the vehicle again.

How serious is the P0471 code?

When the P0471 code appears, you will probably still be able to drive your vehicle. However, this doesn’t mean you should ignore the problem. You may notice that the Check Engine Light comes on and that the vehicle doesn’t perform as well as it did before. You shouldn’t keep driving the vehicle in this condition, as it can eventually cause more problems. Instead, make sure that you take your vehicle to a mechanic for proper repair and diagnosis.

What repairs can fix the P0471 code?

The following are some of the repairs that a mechanic can make to help fix the P0471 code.

  • Use an OBD-II scanner to diagnose the vehicle, and see if the codes return.
  • Check wiring and connectors to make sure nothing is shorted or corroded. They will make replacements and repairs if needed.
  • Check the exhaust pressure sensor.
  • Check the tubing that connects the exhaust pressure sensor to the exhaust manifold and make sure it is clear.

Additional comments for consideration regarding the P0471 code

If your vehicle has the P0471 code stored, you can probably still drive it. However, you don’t want to drive it for too long without getting it checked out. Even if you do not notice any issues with the performance now, it doesn’t mean there is no problem. It’s true that some of the older vehicles with a lot of miles on them might have false codes triggered sometimes, but you can’t rely on that being the case with your vehicle. You should take the time to get it checked out thoroughly by a mechanic who can diagnose it and make the proper repairs.

Need help with a P0471 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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