What does P0473 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 signal is reading higher than the sensor can normally produce, which points at a wiring fault or a dead sensor.
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 sensor ground wire
- Signal wire shorted to the 5 V reference or to battery voltage
- Water in the connector
- Failed sensor
How to diagnose P0473
- Check the sensor ground first: an open ground drives the signal high.
- Unplug the sensor: if the signal still reads high, look for a short to voltage in the harness.
- If the wiring is good, replace the sensor.
- 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 P0473 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 P0473?
Moderate severity
Usually drivable, possibly with reduced power.
P0473 FAQ
What does P0473 mean?
P0473 stands for "Exhaust Pressure Sensor "A" Circuit High (Bank 1)". The exhaust back pressure sensor measures pressure in the exhaust manifold on many diesels.
Can I drive with a P0473 code?
Usually drivable, possibly with reduced power.
How much does it cost to fix P0473?
It depends on the cause. The likely repairs for P0473 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 P0473?
The most common causes are: open sensor ground wire; signal wire shorted to the 5 V reference or to battery voltage; water in the connector.