P0472 Code: Exhaust Pressure Sensor A Circuit Low
🟠 Moderate severity · drivable
Drivable, but fuel economy and engine performance may suffer, so have it diagnosed soon.
What P0472 means
The exhaust pressure sensor measures backpressure in the exhaust system and sends a voltage signal to the engine computer. This code means that signal is too low, which the computer reads as a possible sensor or wiring fault. It is most common on diesel engines, where the reading is used to manage emissions systems.
Symptoms
- Check engine light is on
- Reduced fuel economy
- Weak engine performance or hesitation
- Rough idle or hard starting on diesels
Common causes
- most common: Faulty exhaust pressure sensor
- common: Damaged or corroded wiring to the sensor
- common: Short to ground in the sensor signal circuit
- less common: Blocked sensor port or clogged exhaust system
- rare: Faulty engine computer
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the exhaust pressure sensor | Yes | $80–200 |
| Repair damaged wiring or connectors | Yes | $50–150 |
| Clean the sensor port and check for exhaust restrictions | Mechanic | $80–250 |
Frequently asked questions
Can I drive with a P0472 code?
Yes, usually. The engine should still run, but expect lower fuel economy and reduced power, so get it checked soon.
What is the most common cause of P0472?
A faulty exhaust pressure sensor. Damaged wiring is the next most likely cause.
How much does it cost to fix a P0472?
Typically $80–$200 for a new sensor. Wiring repairs or a shop diagnosis can add a bit more.
Related codes
P0473
P0473 Code: Exhaust Pressure Sensor A Circuit High
P0474P0474 Code: Exhaust Pressure Sensor A Circuit Intermittent/Erratic
P0475P0475 Code: Exhaust Pressure Control Valve A Malfunction
Related guide: How to Reset a Check Engine Light →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.