P0093 — Fuel System Leak Detected – Large Leak
Category: Powertrain Severity: High
Updated:
DTC code P0093 means: Fuel System Leak Detected – Large Leak. It falls under the "Powertrain" category, with an estimated severity of High. Common causes include cracked high-pressure fuel line, injector with a large leak and loose fuel rail or fitting; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Cracked high-pressure fuel line
- Injector with a large leak
- Loose fuel rail or fitting
- High-pressure pump with internal leak
Symptoms
- Strong fuel smell
- Engine stalls or won't start
- Loss of power
- Fuel puddle under the car
How to diagnose it step by step
- Inspect lines, rail and injectors for fuel.
- Check fitting torque.
- Run an injector back-leakage test (diesel).
- Replace the leaking part.
How to fix it
Look for the leak visually with the engine running and with care. A fuel leak is a fire hazard: do not drive until it is found and fixed.
Estimated repair cost
High-pressure line: $60–250. Injector: $200–650 each.
Frequently asked questions
What does DTC code P0093 mean?
Fuel System Leak Detected – Large Leak.
Is code P0093 serious?
Severity High. Have it checked as soon as possible, especially if it affects safety or the catalytic converter.
Can I keep driving with code P0093?
No. There is a fire risk; have the car towed to a workshop.
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