MasterTuning Fault code dictionary (DTC)

P0093 — Fuel rail pressure: leak detected

Severity: Critical Can you drive? No: stop the vehicle and call a technician Make: All makes (OBD-II standard)
MeaningThe ECU has detected a significant leak in the high-pressure circuit. Treat this as urgent: pressurised diesel on a hot engine is a real hazard.
FamilyPowertrain (P)

Typical symptoms

Strong diesel smell
Power loss or no start
Stains under the car
Engine warning light on

Common causes

Damaged high-pressure line
Loose union
Injector leaking from the body
Deteriorated sealing washers

What to do

Do not continue the journey: stop and have the car looked at. A pressurised diesel leak near the exhaust manifold is one of the few faults that allow no delay.

Frequently asked questions

What does code P0093 mean?

Fuel rail pressure: leak detected. The ECU has detected a significant leak in the high-pressure circuit. Treat this as urgent: pressurised diesel on a hot engine is a real hazard.

Can I keep driving with code P0093 active?

No: stop the vehicle and call a technician

Common causes — P0093

Damaged high-pressure line Loose union Injector leaking from the body Deteriorated sealing washers

How do you fix code P0093?

Do not continue the journey: stop and have the car looked at. A pressurised diesel leak near the exhaust manifold is one of the few faults that allow no delay.

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Where to get it fixed

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