P0456 on Your 2022 Lincoln Nautilus
A P0456 code on your 2022 Lincoln Nautilus means the PCM has detected a very small leak—about 0.020 inches—in the EVAP system. Built on Ford's CD4 platform, the Nautilus uses Ford's EVAP monitoring system, available with a 2.0L turbocharged four-cylinder or a 2.7L twin-turbo V6.
At three-plus years old, your Nautilus is at the early edge of EVAP wear. Most P0456 causes are straightforward to diagnose.
Common Causes
- Gas cap seal wear (33%) — Three years of use degrades the seal. First suspect to check.
- Purge valve seepage (22%) — Ford's purge solenoid can develop a slight internal leak.
- EVAP line looseness (17%) — Connections loosened by thermal cycling and vibration.
- Canister vent valve issue (14%) — The vent valve may develop wear.
- Charcoal canister damage (9%) — Road debris impacts.
- Fuel tank seal (5%) — Slow gasket degradation.
Diagnostic Steps
- Gas cap test — New OEM cap ($15–$30), clear code, monitor.
- Visual inspection — Check EVAP hoses and connections.
- Smoke test — Professional diagnosis pinpoints the leak.
- FDRS diagnostics — Ford dealer tool for EVAP data.
- Component testing — Individual valve testing.
Repair Costs
- Gas cap: $15–$30 (DIY)
- Purge valve: $150–$330
- Canister vent valve: $170–$350
- EVAP hose repair: $90–$230
- Charcoal canister: $270–$530
Warranty Coverage
Your 2022 Nautilus is covered under Lincoln's 4-year/50,000-mile comprehensive warranty through 2026 and the federal emissions warranty for 8 years/80,000 miles through 2030.