Fault code P0193 – a step-by-step guide to diagnosing and fixing it

Error code P0193 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the fuel rail pressure sensor. This DTC P0193 indicates that the fuel pressure sensor signal is too high, which can affect the fuel supply and engine performance.

What can cause this error code?

• Defective fuel rail pressure sensor
• Damaged wiring to the pressure sensor
• Corroded or loose plug connections
• Defective fuel pump with excessive pressure
• Clogged fuel return line
• Defective fuel pressure regulator
• Short circuit in the sensor circuit
• Defective engine control unit (ECU)

What symptoms occur in parallel with fault code P0193?

• Starting problems: The vehicle is difficult to start or does not start at all
• Erratic idling: The engine runs irregularly at idle speed
• Loss of power: Significant reduction in engine power when accelerating
• Increased fuel consumption: Noticeably higher consumption than usual
• Jerking: Engine jerks especially under load
• Stalling: Engine stalls while driving

How can I fix the problem with error code P0193?

• Repairing trouble code P0193 requires a systematic diagnosis of the fuel pressure system.
• Replace the fuel rail pressure sensor completely and use new seals
• Check the wiring to the sensor and replace damaged cables with new ones
• Clean plug connections, apply contact spray and connect firmly
• Measure the fuel pressure and replace the fuel pressure regulator if there is excess pressure
• Check the fuel return line for blockages and flush through
• Test fuel pump and replace completely if defective
• Check the sensor circuit for short circuits with a multimeter and repair
• Read out engine control unit, reset or replace if defective