Investigating P0446 on Your 2022 Lincoln Navigator
A P0446 code on your 2022 Lincoln Navigator points to an EVAP vent control circuit malfunction. The Navigator uses the 3.5L twin-turbocharged V6 on the T3 body-on-frame platform. The EVAP system features a canister vent solenoid controlled by the PCM, with Ford's standard EVAP monitoring architecture.
The Lincoln basic warranty (4yr/50k) may still be active. The powertrain warranty (6yr/70k) extends through 2028.
Clues and Symptoms
- Check engine light with P0446
- Fuel fill difficulty
- EVAP readiness monitor incomplete
- Possible fuel odor near the rear
Top Suspects
- Canister Vent Solenoid Failure (High Likelihood): The vent solenoid fails electrically or mechanically. Body-on-frame design means extensive underbody EVAP routing. Replacement costs $140–$270.
- Purge Valve Malfunction (High Likelihood): The purge valve sticks, disrupting EVAP flow. The twin-turbo V6 generates significant intake vacuum variations. Replacement runs $130–$250.
- Vent Solenoid Wiring or Connector (Medium Likelihood): Body-on-frame underbody routing exposes wiring to road conditions. Repair costs $90–$200.
- Charcoal Canister (Medium Likelihood): The Navigator's large fuel tank creates higher EVAP demands on the canister. Replacement runs $220–$400.
- Gas Cap Seal (Low Likelihood): Worn seal. Replacement is $15–$35.
How to Investigate
Scan for all codes. FORScan (~$60, Ford/Lincoln enthusiast tool) provides enhanced diagnostics including commanded vent solenoid testing. FDRS at a Lincoln dealer offers full factory-level diagnosis. Check the gas cap first, then inspect the vent solenoid connector.
Warranty and Cost
Lincoln's basic warranty (4yr/50k) may still apply. The powertrain warranty (6yr/70k) covers through 2028, and federal emissions warranty (8yr/80k) through 2030. Out of warranty: $130–$400.
Safe to Drive?
Yes. P0446 doesn't affect your Navigator's twin-turbo V6 power, 4WD, air suspension, towing capacity, or any luxury features.