Fault code P0470 – a step-by-step guide to diagnosing and fixing it

Error code P0470 is displayed and the check engine light is on - what does this mean?

The OBD system detects a fault in the exhaust pressure sensor, which monitors the pressure in the exhaust system. This DTC P0470 trouble code mainly affects the exhaust gas recirculation system (EGR) and the emission control system, although slight variations in sensor placement can occur with different manufacturers.

What causes can this fault code have?

• Defective exhaust pressure sensor
• Blocked or damaged sensor signal lines
• Corroded or loose plug connections on the sensor
• Blocked EGR valve or EGR lines
• Defective engine control unit software
• Damaged sensor wiring harness
• Dirty or clogged exhaust manifold
• Faulty ground connection of the sensor

What symptoms occur in parallel with fault code P0470?

• Engine performance: Reduced engine power and poor acceleration
• Idle problems: Unsteady or unstable idling
• Exhaust emissions: Increased pollutant levels and black smoke
• Fuel consumption: Significantly increased fuel consumption
• Starting behavior: Difficult cold starts or prolonged warm-up
• Engine noises: Unusual knocking noises or rough engine running

How can the problem with fault code P0470 be rectified?

• Repairing fault code P0470 requires a systematic approach to identify the exact cause.
• Replace exhaust pressure sensor completely and recalibrate with EOBD device, including checking the correct voltage values
• Thoroughly clean EGR valve and associated lines or replace completely if heavily soiled
• Check and clean all plug connections on the sensor wiring harness and replace the affected contacts if they are corroded
• Update the engine control unit software to the latest version and carry out sensor calibration
• Check the complete wiring harness of the exhaust pressure sensor for damage and repair or replace defective sections
• Dismantle exhaust manifold and remove soot deposits, including cleaning sensor mounting threads