P1455moderate severityPowertrain
EVAP System Leak Detected (Gross Leak / No Flow)
on 2004 Lincoln Aviator 4.6L V8 DOHC · AWD
What this code means
The PCM has detected a large leak in the Evaporative Emission Control System, or there is no flow through the system. This indicates a significant breach in the sealed EVAP system.
Symptoms
- Check Engine Light
- Fuel odor
- Poor engine performance possible
- Difficulty refueling
- Failed emissions test
Common causes
- Loose or damaged gas cap (most common)
- Cracked or disconnected EVAP hoses
- Faulty purge valve
- Damaged charcoal canister
- Fuel tank or filler neck damage
- Missing or damaged EVAP system component
Diagnostic steps
- Inspect gas cap — tighten or replace
- Visual inspection of all EVAP hoses and connections
- Smoke test EVAP system to locate leak
- Test purge and vent valves
- Inspect charcoal canister
- Check fuel filler neck
Repair notes
Replace gas cap first (most common). Smoke test to find larger leaks. Replace damaged hoses or components.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1