ShopBaseComplete shop management for auto repair shops · $249/mo
Try ShopBase →
Home/DTC Codes/Lincoln/MKX/2014-2014 3.7L V6/P1455
P1455

EVAP System Leak Detected (Gross Leak / No Flow)

2014-2014 Lincoln MKX 3.7L V6

Moderate SeverityPowertrain

The 2014 Lincoln MKX is equipped with a 3.7L V6 engine. Below you'll find detailed p1455 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

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

  1. Inspect gas cap — tighten or replace
  2. Visual inspection of all EVAP hoses and connections
  3. Smoke test EVAP system to locate leak
  4. Test purge and vent valves
  5. Inspect charcoal canister
  6. Check fuel filler neck

Repair Notes

Replace gas cap first (most common). Smoke test to find larger leaks. Replace damaged hoses or components.

Related Codes

P0442EVAP System Leak Detected (Small Leak)P0455EVAP System Leak Detected (Gross Leak)P1443EVAP System Control Valve MalfunctionP1443EVAP System Purge Flow FaultP1443EVAP Canister Control Vacuum Switch CircuitP1443EVAP Canister Control Vacuum Switch CircuitP1443EVAP Vent Control Function ProblemP1443EVAP System Control Valve MalfunctionP1443EVAP System Control Valve MalfunctionP1450Unable to Bleed Up Fuel Tank VacuumP1450Secondary Air Injection System Circuit ShortP1450Unable to Bleed Up Fuel Tank VacuumP1450Unable to Bleed Up Fuel Tank VacuumP1450Secondary Air Injection System Circuit ShortP1450Secondary Air Injection System Circuit ShortP1450Secondary Air Injection System Circuit ShortP1450Secondary Air Injection System Circuit ShortP1450Unable to Bleed Up Fuel Tank VacuumP1451EVAP Control System Canister Vent Solenoid Circuit MalfunctionP1451EVAP Control System Canister Vent Solenoid Circuit MalfunctionP1451EVAP Control System Canister Vent Solenoid Circuit Malfunction

Other Powertrain Codes

P1455 on Other Vehicles

Lincoln Aviator

2003-2003 4.6L V8 DOHC

Lincoln Aviator

2004-2004 4.6L V8 DOHC

Lincoln Aviator

2005-2005 4.6L V8 DOHC

Lincoln Aviator

2020-2020 3.0L Twin-Turbo V6

Lincoln Aviator

2020-2020 3.0L V6 Twin Turbo

Lincoln Aviator

2020-2020 3.0L V6 Twin Turbo Hybrid

Lincoln Aviator

2021-2021 3.0L Twin-Turbo V6

Lincoln Aviator

2021-2021 3.0L V6 Twin Turbo

Common Questions

What does code P1455 mean on a 2014-2014 Lincoln MKX?

P1455 stands for "EVAP System Leak Detected (Gross Leak / No Flow)". 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.

What are the symptoms of P1455 on a Lincoln MKX?

Common symptoms of P1455 include: Check Engine Light, Fuel odor, Poor engine performance possible, Difficulty refueling, Failed emissions test.

What causes P1455 on a 2014-2014 Lincoln MKX?

Common causes of P1455 include: 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.

Last updated: March 2026

View Labor Times | View Torque Specs | View Fluid Specs