On a Mercedes, the EIS — the switch your key turns in — is the whole key system. Keys lost or switch failing, the dealer sells you a new one. Mail us yours: we make the keys, or repair and clone the switch, on the bench.
On most Mercedes-Benz cars from the late 1990s through the mid-2010s, your ignition key talks to one part: the EIS — the Electronic Ignition Switch, the switch the key slides or turns in. The EIS holds the key data and gives the car permission to start. When all keys are lost, or the EIS itself starts failing (key turns but nothing happens, intermittent no-start, no crank), the dealer's answer is a new EIS plus new keys at dealer prices.
There is a better route, and it fits in a shipping box. Mail us your EIS — we make new keys programmed to it, or test, repair, and clone a failing EIS into a good unit — and ship it back ready to install.
One honest exception: Mercedes' newer FBS4 system (on many 2014-and-up models) locks key work down hard, and on a good number of those cars the dealer truly is the only route. Call with your year and model — if yours is dealer-only, we will tell you straight instead of selling you a maybe.
The step-by-step is on our mail-in module programming page: call first with your VIN, ship the EIS (packed well and insured, with your name, phone, return address, and the car's details in the box), and we program and return it tracked. Priced by model, quoted on the call before you ship. Also see BMW mail-in keys and Range Rover mail-in keys.
Mention this website when you call for 10% off any service.
Two minutes on the phone tells us whether your module can be programmed by mail — and exactly what to put in the box.
Fill out this quick form and get your discount code instantly — 10% off any service we offer. Need a spare? Take 50% off a second key for the same vehicle when we make it during the same visit.