Mercedes ML / GL / R-Class EIS Repair (W164 / X164 / W251 — 2008-2012)
ML/GL/R key won't turn, or the EIS is dead? We repair (not clone) the original EIS on Mercedes 2008-2012 DAS3 infrared systems — your keys keep working.
Sending several modules? Add them all — one box, one return-shipping charge.
Mercedes W164 (ML), X164 (GL), W251 (R) — 2008-2012 (DAS3 infrared EIS)
How It Works
Three simple steps. Hundreds of mail-in jobs completed for shops, locksmiths, and DIY pros.
Pay & Get Address
Click "Order Now", pay securely online. We email shipping address + instructions within minutes.
Ship Your Module
Pack per the instructions and ship to Arlington. USPS goes to our PO Box; UPS and FedEx must use the street address. Customer pays shipping to us.
Receive in 1-2 Days
Work completed within 24 hours of receipt. Ships back next business day at the return speed you chose at checkout — standard to overnight. Tracking emailed.
What You Get
- Component-level repair of the failed EIS (no donor required)
- Original VIN binding + key pairing preserved
- Full bench-test with your supplied working key
- No additional ECU or ESL re-programming needed after install
- Typical 24-hour bench turnaround
- Return shipping your choice at checkout — standard, 2-day, or overnight
- Photo of completed bench-test before shipping back
Compatibility
Confirm your part matches one of the variants below before ordering. Not sure? Text us a photo and we'll verify.
ML-Class (W164)
GL-Class (X164)
R-Class (W251)
EIS part numbers
Will This Fix My Problem?
Honest answer: here's exactly what this service fixes — and what it doesn't.
Fixes:
- ✓Key inserted but ignition won't turn
- ✓No dashboard illumination when key is inserted/turned
- ✓Cold-weather intermittent failure (often progresses to permanent)
- ✓"Remove key" message stuck on cluster
- ✓Engine cranks intermittently — sometimes works, often doesn't
- ✓Existing keys recognized inconsistently
Won't fix:
- ✗All keys lost (no working key to bench-test against)
- ✗EIS physically destroyed (water immersion, crush damage)
- ✗Failed ELV/steering lock motor — see our ELV Emulator service
- ✗Pre-2008 W164 (different EIS architecture)
Repair vs Clone — which do you need?
If your EIS is failing but you HAVE a working key, repair is almost always the right call: cheaper, faster, and you keep your VIN-bound module (no donor sourcing headache). If you've lost ALL keys, you need our EIS Key Replacement service instead. If you have a working key but want the certainty of a known-good donor unit, our EIS Cloning service applies. Text (817) 678-3252 with year/model + symptoms if you're unsure.
Shipping Instructions
These details are also emailed to you the moment your payment clears.
We buy and email you a prepaid inbound label, so shipping it to us costs you nothing. Return shipping is selected and paid at checkout — Standard $24.95 (3–5 days), UPS 2-Day $54.95, or UPS overnight $94.95. Pack the EIS in static-protected padding — it's a small, valuable module.
What to include in your box
- The EIS unit (removed from the steering column area)
- AT LEAST ONE working key for bench testing
- Printed order confirmation
- VIN + odometer reading
- Your name, return address, and phone number
Ship to
Auto Module Lab
If shipping USPS
PO Box 120241
Arlington, TX 76012
If shipping UPS or FedEx
1009 Oakwood Ln # 120241
Arlington, TX 76012
Both shipping labels — to the lab and back to you — are purchased the moment you order. Your prepaid inbound label (already addressed) arrives by email; the return ships on the speed you chose at checkout.
Frequently Asked
Still have a question? Text us — replies in minutes.
How is this different from your EIS Cloning service?
Do I need to send a key?
What if no keys work at all?
Will I need to re-pair the ECU or ESL after install?
What if my EIS is from a different chassis (W204, W211, W221)?
Why is the repair more expensive than the cloning?
Related Services
Other bench services for the same brand or use case.
Mercedes EIS Cloning (Pre-2014)
Failed Mercedes EIS leaving you with a car that won't start? We clone it to a replacement EIS — your existing keys keep working, no re-keying the car.
Mercedes Key Replacement via EIS
Lost your only Mercedes key? Ship us your EIS — we program a fresh working key directly on the bench.
Mercedes ELV Emulator Programming
ELV (steering lock) failed? Ship your EIS — we program and supply a matched ELV emulator.
Where we serve Mercedes W164/X164/W251 EIS Repair
Mail-in means nationwide — we accept modules from all 50 states and DC from our Arlington, Texas lab. See your state, metro, or specific vehicle:
Ready to ship?
$399 flat, typical 24-hour turnaround. Pay now, get the shipping address by email, drop it in the mail. Your module is back on your bench within a week.