Fault code P0093 – a step-by-step guide to diagnosing and fixing it

Error code P0093 is displayed and the check engine light is on - what does this mean?

The DTC P0093 is recognized by the OBD/EOBD system when a large fuel leak is detected in the fuel system. This trouble code mainly affects the fuel supply system and can occur with slight variations for different manufacturers, although the basic meaning remains the same.

What causes can this fault code have?

• Defective fuel injectors with leaks
• Damaged fuel lines or hoses
• Defective fuel pump or fuel pressure regulator
• Loose or damaged fuel connections
• Leaking fuel rail (common rail)
• Defective fuel filter or clogged fuel lines
• Damaged fuel tank or leaking tank connections
• Faulty fuel pressure sensors

What symptoms occur in parallel with fault code P0093?

• Starting problems: The vehicle is difficult to start or does not start
• Fuel smell: distinct smell of petrol or diesel in the vehicle area
• Loss of power: Noticeable reduction in engine power while driving
• Smooth engine running: Engine runs unevenly or stutters
• Increased fuel consumption: Significantly higher consumption than usual
• Check engine light: Permanent illumination of the warning light in the dashboard

How can I fix the problem with fault code P0093?

• Repairing fault code P0093 requires a systematic check of the entire fuel system.
• Complete inspection of all fuel lines and hoses for visible leaks, followed by repair or replacement of damaged components
• Check and replace defective fuel injectors, including seals and O-rings
• Test fuel pressure regulator and fuel pump and replace completely if necessary
• Dismantle fuel rail, clean and check for cracks or leaks, replace if necessary
• Replace the fuel filter and check all fuel connections for tightness and leaks
• Calibrate or replace fuel pressure sensors and then reset the entire system using an OBD scanner