P0093 code meaning
Fuel System Leak Detected - Large Leak
Powertrain system Generic code P00xx codes Check engine light
What P0093 means
A leak in the high-pressure fuel system is not measured directly but inferred from a pressure and volume balance. P0093 means the pump is already delivering at its limit and rail pressure still stays well below target. The leak can be external (line, rail) or internal (injector return, relief valve). An external leak is a fire hazard: stop the engine and inspect it.
P0093 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P0093
- Check engine light on
- Loss of power or reduced power mode
- Long cranking
- Fuel smell or visible leak
Common causes of P0093
- Most likelyHigh-pressure line or rail fitting leaking
- Most likelyInjector with excessive leak-off
- PossiblePressure relief or control valve leaking
- PossibleWeak pump or low-pressure supply mistaken for a leak
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injectorsHigh pressure fuel linesFuel railFuel pressure relief valveHigh pressure fuel pump
What each part of P0093 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 93 | The exact fault in that area. |
What to do next
- Note P0093 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0093
What does P0093 mean?
P0093 means "Fuel System Leak Detected - Large Leak". A leak in the high-pressure fuel system is not measured directly but inferred from a pressure and volume balance. It is a generic code, so it means the same on every make.
Is it safe to drive with P0093?
Drive gently and only to a workshop. With P0093 the car can go into limp mode (reduced power) to protect itself.
Will P0093 fail an emissions test?
Yes, it can. P0093 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0093 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0093 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.