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. Your prepaid inbound label arrives by email — shipping to us costs you nothing.
Get It Back Fast
Work typically 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)
Before you order
You diagnose, we service the module.
We don't have your car and we don't diagnose it. Order once you or your mechanic have confirmed this module is the cause. If the work is completed and the car still has the same symptom because of another fault, the work is still done — a bench re-test under warranty is free.
A clone copies what is in your module.
We transfer the data as we read it. If another shop or tool already worked on the module — an unfinished clone, a tune, a delete — that data can come across too. Tell us before you ship.
What "plug-and-play" means.
No dealer programming should be needed when your original data is intact, the donor matches your module (same type, hardware and software family) and the rest of the car works. It isn't a promise that the car will start or run.
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 $29.95 (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
Your prepaid inbound label (already addressed) arrives by email the moment you order; the return label is bought when your module reaches the bench and 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 typically back on your bench within a week.