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 →
Repairs0Labor957Torque6412Fluid16DTC2254Battery2Maintenance0Recalls3
B2100low severityBody

Automatic Headlight Sensor Circuit

on 2011 Lincoln MKX 3.7L V6 · AWD

What this code means

Malfunction in the automatic headlight ambient light sensor circuit.

Symptoms

  • Auto headlights not turning on in tunnels/darkness
  • Headlights on in bright daylight
  • Auto headlight feature disabled
  • Dash light sensor not adjusting brightness

Common causes

  • Faulty ambient light sensor
  • Sensor covered by dashboard object
  • Wiring damage
  • BCM auto-light module fault
  • Sensor window dirty

Diagnostic steps

  1. Check light sensor reading with scan tool
  2. Clean sensor lens on dashboard
  3. Inspect sensor wiring
  4. Test BCM auto headlight output
  5. Verify feature is enabled in settings

Repair notes

Replace ambient light sensor or clean sensor window. Check that nothing is covering the sensor on the dash top.

🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITE
Shop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other Body 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 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 — 10 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 →