What are the common causes of P0094?

A fuel cap seal that no longer holds pressure. A pinhole in an EVAP hose or line. A leaking purge valve seat. A cracked vent valve or charcoal canister. A corroded fuel filler neck.

Check the fuel cap seal and replace the cap if worn. Run a smoke test with the system sealed. Inspect the EVAP hoses and canister for small cracks. Test the purge and vent valves for a leak when closed. Replace the leaking hose or valve once located. Clear the code and retest.

P0094

Fuel System Leak Detected - Small Leak

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P0094 means Fuel System Leak Detected - Small Leak.

Check these first

A fuel cap seal that no longer holds pressure
A pinhole in an EVAP hose or line
A leaking purge valve seat
A cracked vent valve or charcoal canister
A corroded fuel filler neck

What to do next

Check the fuel cap seal and replace the cap if worn
Run a smoke test with the system sealed
Inspect the EVAP hoses and canister for small cracks
Test the purge and vent valves for a leak when closed
Replace the leaking hose or valve once located
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.