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.

Real-world scan data

Seen in

349

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0094 scans

P0299in 34.1% of scans

P0002in 29.8% of scans

P0168in 27.8% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P0094 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX