P0094
Fuel System Leak Detected - Small Leak
Fuel system (high-pressure)
Generic OBD-II
High
What it means
P0094 means the ECM has detected a small leak in the (high-pressure) fuel system — typically the rail can't hold commanded pressure. Common sources are a leaking injector or seal, a fuel-line fitting, or a worn pressure regulator or pump. Because it involves pressurized fuel, it's both a fire and a drivability concern, and it can cause hard starting, stalling, or reduced power.
High
Can I keep driving? Have it checked promptly — a leaking pressurized fuel system is a fire and stalling risk, and hard starting or low power can follow.
Common symptoms
What you'll notice
- Check-engine light on
- Fuel smell around the vehicle
- Long crank or hard starting
- Reduced power or possible reduced-power (limp) mode
- Rough idle or hesitation
Common causes
Most likely first
- Leaking fuel injector or injector sealLikely
- Leaking high-pressure fuel line or fittingCommon
- Faulty fuel pressure regulator or relief valveCommon
- Worn high-pressure fuel pumpLess often
- Cracked fuel rail or damaged sealsLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and monitor commanded vs. actual fuel-rail pressure on a scan tool.
- With the system depressurized safely, inspect injectors, lines, fittings, and the rail for wet fuel or seepage.
- Perform a fuel-pressure leak-down test to see if the system holds pressure.
- Repair or replace the leaking component (injector seal, line, regulator, or pump).
- Clear the code and verify the system holds rail pressure under load.
FAQ
Quick answers
Is it safe to drive with P0094?+
Treat it cautiously. A leak in a pressurized fuel system is a fire hazard and can cause stalling or hard starting — get it inspected right away.
Can I just clear P0094?+
No — clearing it doesn't stop the leak. The ECM will reset it once it again detects the system can't hold pressure.
Related codes
Often seen with P0094
Read & clear P0094 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX