Back to 2011 Lincoln MKX
Help
2011 LINCOLN MKX
3.7L V6•AWD•AUTOMATIC•gas
3 active safety recalls on this vehicle — view recalls
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor983Torque6563Fluid16DTC1878Battery2Maintenance0Recalls3
P1455moderate severityPowertrain

EVAP System Leak Detected (Gross Leak / No Flow)

on 2011 Lincoln MKX 3.7L V6 · 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

  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.

🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other Powertrain codes on this vehicle

🔌 Need this data in your app? It's all in the free API →
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
Stuck on this repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Share:XRedditFBWhatsAppThreadsEmail
⚠ STILL BEHIND THE PAYWALL
The 2011 Lincoln MKX repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy — and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the Lincoln MKX — $99 →
Building an app?
Free API access to all this data — 20 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included.
Try ShopBase →