P0456 on the All-New 2024 Lincoln Nautilus
A P0456 code on your 2024 Lincoln Nautilus—completely redesigned for 2024 with a dramatic new interior featuring a 48-inch panoramic display—indicates the PCM has found a very small leak (0.020-inch equivalent) in the EVAP system. The new Nautilus features a 2.0L turbo I4 with a standard 250 hp or an available 2.0L turbo hybrid, and as a first-year redesign, early EVAP codes are typically minor.
Likely Causes
- Gas cap not fully seated (33%) — The simplest cause. Click firmly.
- Software calibration sensitivity (25%) — First-year redesigns often need calibration refinements.
- Factory EVAP connection variance (18%) — A fitting not fully engaged from assembly.
- Purge or vent valve irregularity (12%) — A marginally out-of-spec component.
- New seal break-in (7%) — Fresh seals needing thermal cycling.
- Transport artifact (5%) — Connection disturbed during delivery.
What to Do
- Check the gas cap — Remove, inspect, reinstall firmly.
- Lincoln dealer visit — Full warranty, zero cost. FDRS diagnostics and TSB check.
- Software update and repair — Dealer handles everything under warranty.
Cost
- Under warranty: $0—covered through 2028 (basic) and 2032 (emissions)
- Gas cap (DIY): $15–$30
Warranty
Your 2024 Nautilus carries Lincoln's 4-year/50,000-mile comprehensive warranty through 2028 and federal emissions coverage for 8 years/80,000 miles through 2032. Take it to the dealer at no cost.