What causes fault code P0471?

• Most likely: Clogged pressure tube/hose between exhaust manifold and sensor (carbon buildup) • Likely: Faulty exhaust pressure sensor (internal failure) • Possible: Exhaust leak upstream of the sensor • Rare: Wiring harness issues (chafed wires or corrosion in connectors)

How do you fix fault code P0471?

STEP 1: Inspect the pressure tube/hose from the manifold to the sensor for clogs. Remove and clean carbon deposits using compressed air or wire. STEP 2: Inspect electrical connector for corrosion. Verify 5V reference voltage and a clean ground (< 0.5 Ohms). STEP 3: Use a scan tool to monitor Exhaust Pressure PIDs. With engine off, it should match MAP/BARO sensor readings. If not, the sensor is likely biased. STEP 4: Replace sensor and perform any necessary adaptations/relearns using OEM software.

Powertrain (Engine & Gearbox)Standard EOBD

P0471 - Exhaust Pressure Sensor "A" Range/Performance

Q: What does fault code P0471 mean?

P0471 is an OBD-II generic code that indicates a range/performance issue with the Exhaust Gas Pressure Sensor 'A' circuit. The ECU monitors the feedback voltage from this sensor to determine the backpressure in the exhaust manifold. During 'key-on engine-off' (KOEO) conditions, the ECU compares the exhaust pressure reading with the Barometric (BARO) or Manifold Absolute Pressure (MAP) sensor. If the sensor reading deviates from these reference values or remains static during engine operation, the ECU triggers the code. This is critical for controlling VGT (Variable Geometry Turbo) vanes and DPF regeneration cycles.

Q: What are the symptoms of fault code P0471?

• Check engine light on (MIL) • Reduced engine power (Limp mode) • DPF regeneration failure • Increased fuel consumption • Abnormal turbocharger noises or surging

Last updated:1 February 2026

Related:Avgastryckgivare, Diesel Particulate Filter (DPF), Turbocharger, MAP-sensor, EGR Valve

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0400

Exhaust Gas Recirculation Flow Malfunction

P0401

Exhaust Gas Recirculation (EGR) Flow Insufficient Detected

P0402

Exhaust Gas Recirculation Flow Excessive Detected

P0403

Exhaust Gas Recirculation (EGR) Control Circuit

Technical Description

P0471 is an OBD-II generic code that indicates a range/performance issue with the Exhaust Gas Pressure Sensor 'A' circuit. The ECU monitors the feedback voltage from this sensor to determine the backpressure in the exhaust manifold. During 'key-on engine-off' (KOEO) conditions, the ECU compares the exhaust pressure reading with the Barometric (BARO) or Manifold Absolute Pressure (MAP) sensor. If the sensor reading deviates from these reference values or remains static during engine operation, the ECU triggers the code. This is critical for controlling VGT (Variable Geometry Turbo) vanes and DPF regeneration cycles.

Possible Causes

Clogged pressure tube/hose between exhaust manifold and sensor (carbon buildup)

Faulty exhaust pressure sensor (internal failure)

Exhaust leak upstream of the sensor

Wiring harness issues (chafed wires or corrosion in connectors)

Symptoms

Check engine light on (MIL)

Reduced engine power (Limp mode)

DPF regeneration failure

Increased fuel consumption

Abnormal turbocharger noises or surging

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P0471 - Exhaust Pressure Sensor "A" Range/Performance

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P0471 - Exhaust Pressure Sensor "A" Range/Performance

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