Fault code P1519 – a step-by-step guide to diagnosing and fixing it

Error code P1519 is displayed and the check engine light is on - what does this mean?

The DTC P1519 is a manufacturer-specific fault code that is recognized by the OBD/EOBD system and indicates a problem with the throttle control or the electronic accelerator pedal. This trouble code mainly occurs in Volkswagen, Audi, Seat and Skoda vehicles and indicates a fault in the drive-by-wire system.

What causes can this error code have?

• Defective throttle valve actuator
• Dirty or sticky throttle valve
• Damaged accelerator pedal potentiometer
• Faulty wiring between control unit and throttle valve
• Defective engine control unit
• Loose or corroded plug connections
• Mechanical blockage of the throttle valve
• Power supply problems at the throttle valve actuator

What symptoms occur in parallel with fault code P1519?

• Idling problems: Unsteady or fluctuating idling
• Acceleration problems: Delayed response to accelerator pedal operation
• Emergency running program: Engine only runs in emergency mode with reduced power
• Starting problems: Difficulty starting the engine or stalling
• Jerking: Engine jerks especially at low engine speeds
• Increased fuel consumption: Significantly higher consumption than usual

How to fix the problem of error code P1519?

• The repair requires a systematic diagnosis to identify the exact cause.
• Remove the throttle valve, clean thoroughly and check for mechanical movement, then carry out basic adjustment
• Replace the throttle valve actuator completely and have it relearned with a diagnostic device
• Replace the accelerator pedal potentiometer and carry out calibration in the control unit
• Check all cable connections between accelerator pedal, throttle valve and control unit for continuity and insulation faults and repair defective cables
• Clean the plug connections on the throttle valve actuator and accelerator pedal, treat with contact spray and tighten firmly
• Measure the voltage supply to the throttle actuator and replace fuses or relays if there are deviations
• Check the engine control unit for software errors and, if necessary, install an update or replace the control unit