P0471 Exhaust pressure sensor A circuit range/performance
What P0471 means
The engine control unit reads exhaust pressure that does not fit the engine's operating conditions. On diesels this sensor is often used to judge soot loading in the particulate filter or back pressure for the turbo, so a bad reading can upset regeneration.
P0471 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Medium
- Typical repair cost
- 80–500 €
- Workshop time
- 0.5–2.5 h
- Repair difficulty
- Medium
- DIY possible
- Yes
- Check engine light
- Yes
- Affects emissions test
- Yes
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Check engine light on
- Reduced power or limp mode on some diesels
- Particulate filter regeneration not completing
- Possible higher fuel consumption
Common causes
- Cracked, disconnected or soot-blocked sensor pipe or hose
- Faulty exhaust pressure sensor
- Clogged diesel particulate filter or catalyst causing real high back pressure
- Exhaust leak upstream of the sensor
- Poor connection at the sensor
Can I keep driving with P0471?
You can keep driving, but have it checked within one to two weeks. If the car goes into limp mode or the DPF light comes on, get it seen sooner.
What to check first
- Inspect the sensor's metal pipe and rubber hose for cracks, melting or soot blockage
- Compare the sensor reading at key-on engine-off with atmospheric pressure
- Check the connector and wiring
- Replace the sensor, or have the particulate filter checked if back pressure is genuinely high
Related codes
- P0463 Fuel level sensor A circuit high
- P0462 Fuel level sensor A circuit low
- P0480 Cooling fan 1 control circuit
- P0461 Fuel level sensor A circuit range/performance
- P0481 Cooling fan 2 control circuit
- P0457 EVAP system leak detected (fuel cap loose/off)
- P0456 EVAP system very small leak detected
- P0455 EVAP system large leak detected
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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