Mercedes EIS/EZS Repair specialists - EIS testing 

Mercedes Benz EIS / EZS Repair and EIS testing 


The Mercedes Benz DAS system mainly works around the EIS Electronic Ignition Switch so any malfunction or  a fault may cause the system to not work as intended


The Electronic ignition Switch holds vital Key data and links to the ECU and ESL Electronic Steering Lock and also acts as a central gateway to other vehicle electrics, Meaning Electronic Steering Lock and key faults could seem to cause other problems in the system.


Some symptoms of a malfunctioning EIS Electronic Ignition Switch include

Not allowing the key to turn in the ignition switch
Not releasing the ESL Electronic Steering Lock when the key is Inserted
Intermittent failure of internal components causing intermittent faults
Complete failure of internal components
DATA corruption
Dirt ingress
Incorrect programming by an incompetent garage/mechanic

Many Electronic Steering Switch's can be easily fixed, with replacement parts or a service exchange unit - If a unit cannot be repaired or replaced we can supply a new unit which is fully plug and play requiring no other programming.


Please use the contact form or send us an email -



Call Now for a Lost or Spare Mercedes key

ReplacementMercedesKeys - Mercedes Key

Mobile Service


Before you call please click here to see what models we cover and HERE for Prices





CALL or TEXT Matt on :

07563 014 634


Please do send us a text if we don't answer and we can call you back asap!



Workshop Opening hours


Mon - Fri: 10am - 5pm

Saturdays 10 am - 1pm


Sundays: CLOSED

Bank Holidays:CLOSED


You must be able to prove ownership of the vehicle before we commence with the job. Please if possible have your vehicle V5 document, and a form of Photo I.D. We will not make a key without them. 

Out of hours emergency Calls - Please leave a text message and we will return your call as soon as we can.


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