Typical symptoms
- No ignition
- Key not recognised
- Vehicle will not start
- Steering lock does not unlock
- Intermittent key faults
- No response when key is inserted
- Automatic transmission unexpectedly goes into Park
Mercedes-Benz Immobiliser Repair
Mercedes EIS, ESL & Start Error Repair Services
Professional Mercedes-Benz electronic ignition, steering lock and immobiliser repair services. We repair EIS / EZS units, provide ESL emulator programming, and resolve Mercedes START ERROR faults caused by ECU, EIS and immobiliser synchronisation issues.
01
Mercedes EIS / EZS Ignition Switch Repair
This service is for faulty Mercedes Electronic Ignition Switch units, also known as EIS or EZS. A faulty EIS can prevent the vehicle from recognising the key, switching ignition on, unlocking the steering lock or allowing the vehicle to start.
Supported models
W204W207W212W218W164W166
02
Mercedes ESL Repair & Emulator Programming
This service is for failed Mercedes Electronic Steering Lock units, commonly known as ESL or ELV. These units are a common failure point on several Mercedes-Benz models. When the ESL fails, the steering wheel may remain locked and the vehicle may not switch ignition on or start.
An ESL emulator replaces the failed mechanical steering lock with a programmed electronic bypass solution matched to the vehicle.
Typical symptoms
- Steering wheel locked
- Steering lock does not unlock
- No click from steering lock
- No dashboard lights
- Key turns but vehicle will not start
- Steering lock noisy or intermittent
- Vehicle completely immobilised
Supported models
W204 C-ClassW207 E-Class CoupeW212 E-Class
03
Mercedes START ERROR Repair
Mercedes START ERROR is usually caused by a loss of synchronisation between the engine ECU, EIS / EZS and immobiliser system. This fault is commonly found on older Mercedes CDI vehicles using EDC15C0 and EDC15C6 engine control systems.
Typical symptoms
- START ERROR shown on dashboard
- Vehicle will not start
- Starter disabled
- P1630 fault code stored
- Immobiliser communication failure
- Key recognised but engine will not start
Required parts for repair
- Engine ECU
- EIS / EZS or immobiliser control unit
- At least one vehicle key
CDI1 / EDC15C0
- W168 A-Class
- W202 C-Class
- W210 E-Class
- W638 Vito / V-Class
CDI2 / EDC15C6
- W203 C-Class
- W210 E-Class
- Sprinter 901
- Sprinter 902
- Sprinter 903
FAQ
Frequently Asked Questions
The Mercedes EIS / EZS is the electronic ignition switch that reads the key and allows ignition and start authorisation.
Mercedes ESL failure is commonly caused by worn steering lock motors, internal electronics faults or communication problems.
A Mercedes ESL emulator is a programmed electronic solution that replaces the failed mechanical steering lock on suitable vehicles.
Mercedes START ERROR is an immobiliser synchronisation fault between the engine ECU, EIS / EZS and key system.
Yes, Mercedes START ERROR can often be repaired when the ECU, EIS / immobiliser unit and working key are supplied together.
For START ERROR repair, the engine ECU is normally required so synchronisation data can be checked and repaired.
Yes, at least one vehicle key is normally required for EIS, ESL emulator and START ERROR repair work.
Yes, we can advise from the symptoms and vehicle model which parts are likely to be required for testing.
Send Parts For Repair
Send Your Mercedes Parts for Repair
If you are unsure whether your Mercedes fault is caused by the EIS, ESL or START ERROR synchronisation issue, contact us before sending the parts. We can advise what parts are required based on your symptoms and vehicle model.