Fault code P0094 – a step-by-step guide to diagnosing and fixing it

Error code P0094 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a large leak in the fuel system. This DTC (Diagnostic Trouble Code) indicates that the fuel pump or fuel system has a significant loss of pressure which is affecting normal engine performance.

What can cause this fault code?

• Defective fuel pump
• Damaged fuel filter
• Leaking fuel lines
• Defective fuel pressure regulator
• Clogged fuel injectors
• Loose or damaged fuel hoses
• Defective fuel pressure sensor
• Worn fuel pump relays

What symptoms occur in parallel with fault code P0094?

• Starting problems: The vehicle is difficult or impossible to start
• Loss of power: Significantly reduced engine power while driving
• Jerking when idling: Engine runs unevenly or stalls
• High fuel consumption: Noticeable increase in fuel consumption
• Acceleration problems: Delayed or weak acceleration
• Engine misfires: irregular engine running at different engine speeds

How can I fix the problem with fault code P0094?

• Repairing fault code P0094 requires a systematic check of the entire fuel system.
• Replace the fuel pump completely and also replace the fuel pump bracket and all seals
• Replace the fuel filter and at the same time check all fuel lines for leaks and replace if necessary
• Dismantle and clean the fuel pressure regulator or replace with a new component if defective
• Have the fuel injectors professionally cleaned or replace them completely if they are very dirty
• Check and calibrate fuel pressure sensor or replace with a new sensor if malfunctioning
• Check fuel pump relay and associated fuses and replace defective components