Expert Mercedes Immobiliser Repair services in Ilkeston, Derby, and Nottingham.
Call Us Now: 07783630237JK Car Electrics provides specialist Mercedes immobiliser repair services throughout Derby, Nottingham, Ilkeston and the East Midlands. We specialise in EIS/EZS (Electronic Ignition Switch) and ESL/ELV (Electronic Steering Lock) fault diagnosis and repair. These components are critical to your vehicle's security system—when they fail, the car won't start or you'll see "Steering Lock Defective" warnings.
JK Car Electrics provides specialist Mercedes immobiliser repair services throughout Derby, Nottingham, Ilkeston and the East Midlands. We specialise in EIS/EZS (Electronic Ignition Switch) and ESL/ELV (Electronic Steering Lock) fault diagnosis and repair. These components are critical to your vehicle's security system—when they fail, the car won't start or you'll see "Steering Lock Defective" warnings.
Mercedes-Benz owners may face problems with the key no longer turning the ignition or not starting the car. This is often caused by a damaged/defective key, a failing/failed Electronic Ignition Switch (EIS/EZS), or a bad Electronic Steering Lock (ESL).
When a key is inserted into the EIS, the immobiliser system will instantaneously carry out a check to see if it's a correct "programmed" key that has been inserted. The EIS will verify with the ESL and Engine ECU to check that it is a correct key, and if the units agree it will authorise the vehicle to be started.
Step 1: If you have another key for that vehicle, check if you experience the same symptoms with the spare key — it could be caused by a defective key and not a failing EIS/EZS-ESL module.
Step 2: Get the EIS/EZS tested and either repaired or replaced with a unit from a donor car. A donor unit would need to be programmed to the vehicle so that the stored VIN is matched in all modules.
⚠️ Mercedes Dealership would advise you to purchase a new unit as the EIS Module cannot be repaired or reflashed using the Mercedes Star Diagnostic System. That's not necessarily the only available solution. We are able to offer a testing and repair service as well as programming replacement donor units.
Chassis Codes: W202, W203, W208, W209, W210, W211, W220, W215, W219, W230, W463, W639, W906
Model Range: Mercedes-Benz A-Class, B-Class, C-Class, E-Class, G-Class, S-Class, SL-Class, ML-Class, GL-Class, SLK-Class
Our Mercedes immobiliser repair service in Derby, Nottingham, and Ilkeston specializes in EIS/EZS ignition switch repair and ESL/ELV steering lock repairs for all Mercedes-Benz models. Unlike main dealers who only offer expensive new unit replacement, we provide Mercedes EIS repair, ESL steering lock repair, and used/reconditioned module programming services across Derbyshire, Nottinghamshire, and the East Midlands. Whether your Mercedes won't start in Derby, displays "Steering Lock Defective" in Nottingham, or has key detection faults in Ilkeston, our mobile and workshop Mercedes immobiliser repair service covers all FBS3 security system issues at a fraction of main dealer costs.
The EIS reads your key and communicates with the engine ECU
Mechanical lock controlled electronically
Re-sync keys after component replacement
Professional fault diagnosis and testing
All Mercedes-Benz models up to 2014 including:
W203, W204 (up to 2014)
W211, W212 (up to 2014)
W220, W221 (up to 2014)
W164, W166 (up to 2014)
All Sprinter models up to 2018
A-Class, B-Class, CLS, SLK, GLK, Vito (up to 2014)
All Mercedes on request
We offer the same technical capability as the main dealer, but with repair services they don't provide and lower total cost. Main dealers only fit brand new units — we can repair your original unit or program used/reconditioned replacements where applicable, saving you hundreds of pounds.
Can you repair my steering lock without replacing it?
In many cases yes. We can repair ESL mechanisms and components. If repair isn't viable, we can install an ESL emulator or replace and program a used ESL unit.
My key is not detected - is it the EIS or the key?
We'll test the key signal strength and EIS module to determine the cause. Often it's a worn EIS rather than a faulty key.
How long does EIS/ESL repair take?
Most repairs are completed in 2-4 hours. Complex cases requiring module replacement and key synchronisation may take longer.
Can you repair water-damaged EIS units?
Yes, we can often repair water-damaged EIS/EZS units caused by A-pillar leaks or sunroof drainage issues. Assessment is required to determine repairability.
Do you program donor EIS/ESL units?
Yes, we can program used EIS and ESL units from donor vehicles, matching the VIN and synchronising keys to your Mercedes.
What Mercedes models do you support?
We support all Mercedes-Benz models up to 2014 (FBS3) including W202, W203, W204, W210, W211, W212, W220, W221, Sprinter, Vito, and all A, B, C, E, S-Class variants.
What areas do you cover?
We provide mobile and workshop Mercedes immobiliser repair services across Derby, Nottingham, Ilkeston, Derbyshire, Nottinghamshire, and the East Midlands.
Core coverage: Ilkeston, Derby, Nottingham. Extended mobile service: wider Derbyshire, Nottinghamshire & parts of Leicestershire within a 30‑mile rapid dispatch radius.
Serving: Ilkeston, Nottingham, Derby, Leicester, Mansfield, Chesterfield, Burton upon Trent, Loughborough, Long Eaton, Beeston, Sutton-in-Ashfield, Ashbourne, Newark-on-Trent, Matlock, Alfreton, Heanor, Ripley, Belper, Arnold, Hucknall, Swadlincote, Ashby-de-la-Zouch, Coalville & nearby villages.
Fully insured, ID & DBS checked for professional on-site work. Request a quote.