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OBD code P0471

The exhaust pressure sensor signal does not match atmospheric pressure, intake pressure or engine load.

Estimated severity
Medium
Common symptoms
  • Check engine light on
  • Power loss or limp mode
  • Interrupted or failed DPF regenerations
  • Possible DPF or turbo-related codes
  • Higher fuel consumption
Likely causes
  • Blocked exhaust pressure sensor pipe
  • Sensor contaminated with soot or condensation
  • Faulty exhaust pressure sensor
  • Wiring or connector damaged by heat
  • Exhaust leak near the sensor pick-up
Recommended checks
  1. 1. Compare the sensor reading with atmospheric pressure when the engine is off.
  2. 2. Inspect and clean the pressure pipe if it is blocked by soot.
  3. 3. Check wiring and connector condition close to the exhaust.
  4. 4. Check whether the signal changes logically with rpm and load.
  5. 5. Diagnose related DPF or turbo faults only after confirming the sensor signal.

What does code P0471 mean?

P0471 appears when the exhaust pressure sensor gives an implausible or slow signal. On diesel engines, this sensor may be used for turbo control, EGR strategy and DPF regeneration. A bad reading can trigger false DPF, turbo or EGR symptoms, so it should be checked before replacing expensive parts.

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