What does P0471 mean?
The exhaust back pressure sensor measures pressure in the exhaust manifold on many diesels. The computer uses it for EGR and turbo control.
The circuit is electrically intact, but the reading does not make sense for the operating conditions. Sometimes the sensor is fine and is reporting a real problem.
Codes are a starting point. They tell you which test failed, not which part to replace. Check for other stored codes and fix those in a sensible order.
Symptoms
- Check engine light
- Reduced power
- Turbo or EGR related drivability issues
Common causes
- Sensor reading that does not match other sensors (a skewed or slow sensor)
- Mechanical problem the sensor is correctly reporting
- Restricted or leaking hose/port to the sensor
- High resistance in the connector
- Clogged sensor tube (carbon or moisture)
- Failed sensor
- Wiring problem
How to diagnose P0471
- Compare the live reading with related sensors and with known values (key on, engine off and at idle).
- Inspect hoses, ports and the connector for damage, oil or corrosion.
- Only replace the sensor after ruling out the real-world condition it measures.
- Key on, engine off, the reading should match barometric pressure.
- Remove and clear the sensor tube.
How to fix it
- Clean the sensor tube
- Replace the sensor
- Repair wiring
Estimated repair cost
Likely repairs for P0471 run from about $100 to $350, depending on the cause.
| Repair | Typical range (parts + labor) |
|---|---|
| Diagnostic fee (scan + testing) | $100 - $200 |
| Exhaust back pressure sensor | $100 - $350 |
These are rough US estimates for an independent shop in 2026, based on typical parts prices and standard labor times. Dealers, big trucks, luxury brands and high-cost areas often run higher. They are not quotes. Use the repair cost estimator to adjust for your vehicle.
How serious is P0471?
Moderate severity
Usually drivable, possibly with reduced power.
P0471 FAQ
What does P0471 mean?
P0471 stands for "Exhaust Pressure Sensor "A" Circuit Range/Performance (Bank 1)". The exhaust back pressure sensor measures pressure in the exhaust manifold on many diesels.
Can I drive with a P0471 code?
Usually drivable, possibly with reduced power.
How much does it cost to fix P0471?
It depends on the cause. The likely repairs for P0471 range from about $100 to $350 at an independent shop in the US, plus a diagnostic fee of roughly $100-$200. These are rough estimates; dealer prices and some vehicles run higher.
What is the most common cause of P0471?
The most common causes are: sensor reading that does not match other sensors (a skewed or slow sensor); mechanical problem the sensor is correctly reporting; restricted or leaking hose/port to the sensor.