Error code

OBD2 P0471

OBD2P0471
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Exhaust Pressure Sensor Range/Performance.

Severity

moderateCan be driven, but performance issues may occur.

Summary

P0471 indicates an issue with the exhaust pressure sensor's range or performance. This sensor is typically located near the turbocharger in diesel engines and helps monitor exhaust backpressure.

Symptoms

  • Check engine light comes on
  • Decreased fuel efficiency
  • Loss of power under certain conditions

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors
  • Illegal modifications to the exhaust system
  • Defective exhaust pressure sensor
  • Clogged or restricted tube connecting the backpressure sensor to the exhaust system

Diagnosis

  1. Inspect wiring and connectors for damage or corrosion
  2. Check for any unauthorized modifications to the exhaust system
  3. Verify that the tube connecting the sensor to the exhaust is not clogged

Fixes

  • Replace defective exhaust pressure sensor

FAQ

What causes P0471?

Common causes include wiring issues, unauthorized modifications to the exhaust system, a faulty sensor, or clogged tubes.

Is it safe to drive with P0471?

It is generally drivable but may experience decreased fuel efficiency and power loss under certain conditions.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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