What does P0472 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 computer is seeing a signal voltage that is lower than the sensor should ever produce, so it is almost always an electrical problem rather than a mechanical one.
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
- Open in the 5 V reference wire
- Signal wire shorted to ground
- Unplugged or corroded connector
- Failed sensor
How to diagnose P0472
- With the key on, back-probe the connector: you should see about 5 V on the reference wire and a good ground (under 0.1 V drop).
- If reference and ground are good, check the signal wire for a short to ground with the connector unplugged.
- If the wiring checks out, the sensor itself is the likely fault.
- 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 P0472 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 P0472?
Moderate severity
Usually drivable, possibly with reduced power.
P0472 FAQ
What does P0472 mean?
P0472 stands for "Exhaust Pressure Sensor "A" Circuit Low (Bank 1)". The exhaust back pressure sensor measures pressure in the exhaust manifold on many diesels.
Can I drive with a P0472 code?
Usually drivable, possibly with reduced power.
How much does it cost to fix P0472?
It depends on the cause. The likely repairs for P0472 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 P0472?
The most common causes are: open in the 5 V reference wire; signal wire shorted to ground; unplugged or corroded connector.