Mercedes FBS4 Immobiliser Bypass (Bosch MEDC17 ECUs)
Mercedes FBS4 Immobiliser Removal service for cars with Bosch ECUs.
Do you need to replace the faulty ECU in your FBS4 Mercedes-Benz and the original ECU is missing or damaged?
We can help by bypassing the start authorisation in your replacement ECU. This allows you to fit the replacement ECU and start your vehicle without dealer programming.
All Bosch MEDC17 ECUs supported.
If you’re unsure which ECU you have, please send us your ECU details and we’ll confirm compatibility.
We also repair Mercedes FBS4 Ignition Switch & DSM — please check our Mercedes section for more information.
Ready to order?
- Please fill the form below to send us the details of your ECU or vehicle
- Pay for the service
- Package and post your ECU to:
- Pelican Diagnostics
- Padley Farm
- Drove Lane
- Sleaford
- NG34 8JQ
Please include your order number and name in the parcel.
Once received, required service will be done within 24hrs and posted back on a next day service.
Why choose Pelican Diagnostics for Mercedes FBS4 immobiliser removal?
Supports all Bosch MEDC17 ECUs used in FBS4 Mercedes systems
Fast turnaround — service completed within 24hrs and returned next day
Experienced technicians — safe, bench-tested procedures preserving ECU function
Local & postal service — bring it in or post to our Sleaford workshop
Frequently Asked Questions
What is an FBS4 immobiliser bypass for Mercedes?
An FBS4 immobiliser bypass disables the start-authorisation check inside a replacement ECU so the vehicle will start without the original immobiliser data. This is used when the original ECU is missing, damaged, or cannot be cloned.
Which ECUs do you support for Mercedes Immobiliser Bypass?
We support Bosch MEDC17 ECUs used in FBS4 Mercedes systems. If you’re unsure of your ECU type, send us the ECU details and we’ll confirm.
Will the car need programming after the bypass?
In most cases, no additional dealer programming is required — the ECU is modified so the vehicle will start. If any vehicle-level coding is needed, we’ll notify you before returning the unit.
How long does the FBS4 immobiliser bypass take?
We complete the service within 24 hours of receiving the ECU and post it back on the next working day. Walk-in customers can often have the service done while they wait.
Is the bypass reversible?
Reversibility depends on ECU type and the method used. We’ll explain whether the change is reversible for your specific ECU before we proceed.
My ECU is damaged — can you still help?
We bench-test every ECU on arrival. If a unit is unreadable or irreparable, we’ll contact you with options (repair, refurbished ECU, or return).
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