Fault code P0453 – a step-by-step guide to diagnosing and fixing it

Error code P0453 is displayed and the check engine light is on - what does this mean?

DTC P0453 is triggered by the OBD/EOBD system when a high signal is detected in the fuel tank pressure sensor circuit. This fault code affects the fuel evaporative emission system (EVAP) and can occur in various manufacturers such as BMW, Mercedes-Benz, Audi and Volkswagen.

What can cause this fault code?

• Defective fuel tank pressure sensor
• Damaged wiring to the pressure sensor
• Corroded or loose plug connections
• Short circuit in the sensor cable
• Defective engine control unit (ECU)
• Mechanical damage to the fuel tank
• Faulty ground connection of the sensor

What symptoms occur in parallel with fault code P0453?

• Check engine light: The check engine light is permanently illuminated
• Fuel consumption: Increased fuel consumption due to faulty EVAP function
• Emission problems: Deteriorated exhaust values during the main inspection
• Fuel vapors: Perceptible petrol smells around the vehicle
• Starting problems: Occasional difficulties starting the engine
• Power loss: Minimal impairment of engine performance

How to fix the problem of error code P0453?

• The repair requires a systematic diagnosis of the EVAP system and the affected components.
• Replacement of the defective fuel tank pressure sensor with an original spare part
• Repair or replace the damaged wiring between the sensor and control unit
• Cleaning and securing all plug connections in the EVAP system
• Checking and repairing the ground connections on the fuel tank
• Diagnosis and, if necessary, replacement of the engine control unit
• Complete system check with professional OBD scanner for error confirmation