FBS4
Adapting, cloning and programming FBS4 control units.
On newer Mercedes models the FBS4 drive authorisation system protects control units, ignition switch and keys. A replacement or used part therefore doesn’t simply work. We adapt FBS4 control units to your vehicle.
What we do with FBS4
- Adapting used FBS4 control units to your vehicle
- Cloning FBS4 control units, e.g. engine or transmission control unit
- Programming and coding after replacement
- Restoring interaction with ignition switch (EZS), ELV and keys
- Checking in advance what is possible with your part
Why FBS4 is special
FBS4 is the fourth-generation drive authorisation system. Control units, ignition switch and keys are firmly linked with each other. If one of them is replaced, the new part has to be integrated into the system – otherwise the vehicle won’t start.
We only work on FBS4 systems with proof that the vehicle is yours: registration document and ID card. What is possible with your part depends on the unit and its condition – we check this in advance and give you the price.
Focus on Mercedes-Benz. AEZ is an independent master workshop; brand names are used for description only. We tell you whether a repair is possible after testing.
How the repair works.
- 1
Get in touch
Vehicle, VIN and what happened – via WhatsApp, phone or form.
- 2
Drop off or send in
Hand it in at Bottrop or, after a quick chat, send it by DHL. How shipping works
- 3
Test, price, repair
You get the findings and price before we repair. Then the unit goes back to you.
Frequently asked questions
Can I use a used FBS4 control unit?
Often yes – but it has to be adapted to your vehicle. Give us the part number and VIN and we’ll tell you in advance whether it works for your unit.
How much does the repair cost?
That depends on the unit and the fault. After testing we tell you the price – we only repair with your approval.
Can I send the control unit in?
Yes. After a quick chat, by DHL to AEZ, Werkstraße 4, 46240 Bottrop, Germany. Packing tips and the shipping note to fill in are on the “Sending in a control unit” page.
Do you only work on Mercedes-Benz?
Our focus is Mercedes-Benz. For other makes, just ask with the vehicle and part number – we’ll tell you honestly whether we can help.