Fault code P0472 – a step-by-step guide to diagnosing and fixing it

Error code P0472 is displayed and the check engine light is on - what does this mean?

The OBD system detects too low a voltage in the exhaust pressure sensor circuit. This DTC P0472 indicates a problem with the exhaust pressure sensor, which monitors the back pressure in the exhaust system and is important for optimum engine control.

What causes can this error code have?

• Defective exhaust pressure sensor
• Damaged wiring to the sensor
• Corroded or loose plug connections
• Short circuit in the sensor cable
• Defective engine control unit (ECM)
• Blocked sensor lines or hoses
• Power supply problems
• Mechanical damage to the sensor

What symptoms occur in parallel with fault code P0472?

• Engine indicator light: Lights up continuously or flashes
• Loss of power: Reduced engine power at higher engine speeds
• Unsteady idling: Engine runs unevenly at idle speed
• Increased fuel consumption: Poorer fuel consumption values
• Exhaust problems: Increased emission values during the emissions test
• Starting problems: Difficult cold starts or longer starting times

How can the problem with error code P0472 be rectified?

• The repair requires a systematic diagnosis to identify the exact cause.
• Replace the exhaust pressure sensor completely, including seals and mounting material, and then calibrate the system
• Completely check the wiring to the sensor and repair or replace damaged cables or plug connections
• Clean the sensor lines and vacuum hoses or replace them completely if they are blocked
• Measure the power supply to the sensor and replace the corresponding fuses or relays if there are problems
• Diagnose the engine control unit and replace or reprogram if defective
• Check all electrical connections to the sensor and clean or replace corroded contacts