Fault codeP0094

MODERATE

Fuel System Leak Detected Small Leak

What this code means

Fuel System Leak Detected Small Leak.

P0094 is a generic code: it means the same thing on every make. P0094 belongs to family P00xx — Fuel and air metering, auxiliary emission controls. Its page explains how to read a code and groups all its codes by part.

Fuel pressure regulation

On direct-injection petrol and common-rail diesel engines, a high-pressure pump feeds the injectors through a rail. The control unit regulates the pressure with a valve on the pump (volume or metering regulator) and/or a valve on the rail, and checks the result with the rail pressure sensor.

What you notice

Hard starting, loss of power, jerks, limp mode; the engine may stall if the pressure falls too low.

How to check it

Before blaming the high-pressure side, check the low-pressure supply: a clogged fuel filter, a weak in-tank pump or air in the diesel line cause many of these codes. Then check the regulator's connector and resistance. Look for leaks on the injector returns. Klaro's rail pressure reading shows whether the pressure follows the demand.

Watch it live in Klaro

With an OBD2 adapter plugged in, these live readings show the part at work, when your car reports them:

Fuel rail pressure (absolute)
Fuel rail absolute pressure
Fuel pressure

What to do

Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.

Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back. Clearing a fault code yourself →

How to read this code

PPowertrain
0standardised code
0Fuel and air metering, auxiliary emission controls
94P0094