Mercedes EIS / EZS Immobiliser Key Module – Recoding & Repair Service

Contact UsMercedes EIS ProblemsMercedes EIS (Electronic Ignition Switch) Modules
The Mercedes EIS (Electronic Ignition Switch) system is great in theory, the hardware being the switch is like a small socket in the dash to insert your key into – only, it is not a traditional looking key. It is more like a plastic lego-brick with what looks like an infra-red panel at the face of it which is inserted into the EIS socket on the dash. The key has a sequential code to ensure the vehicle is not stolen.

The vehicle will instantaneously carry out a sequence of test handshakes to ensure the correct key has been inserted. Each time the key is inserted, the EIS system will check the key and then ask the ESL (Electronic Steering Lock) system for verification that it accepts the correct key is being used. The ESL system will then look to see if the Engine ECU (Electronic Control Unit) agrees that this is the authorised key being used. – Then and only then, when all three control units agree it is the correct authorised key being used, will it allow the “Turn & Start” function to be activated.

Which Model Mercedes Has The EIS Module
The EIS module is factory fitted to almost all models and we’re getting units sent in right across the board from C-Class C220 Mercedes to ML’s and E350 Mercedes. You can expect the EIS module to be supported and installed on the following Chassis list:

W208 / W210 / W203 / W209 / W211 / W215 / W219 / W220 / W230

Mercedes EIS / EZS Immobiliser Key Module Problems

  • Unable To Turn The ¬†Key
  • Unable To Start The Car
  • Can Turn The Key – But Car Won’t Start
  • Intermittent Ignition Key Faults

If the EIS unit becomes faulty, the “Turn & Start” function will be de-activated and the module will be locked for security purposes. This will stop the vehicle from starting. It is very unfortunate but also a very common problem as there are many reasons as to why these units are failing – most are due to human error. Some of the most common reasons are listed below:

  • Jump Starting Whilst Key Is Inserted
  • Power Surge
  • Low Battery Voltage

All of the above can cause memory loss to the EIS module and it cannot be repaired or re-flashed using the Mercedes STAR diagnostic system. At this point, you would have been advised to purchase a new unit which can work out extremely expensive when working out the total bill with programming and labour inclusive with VAT.

One of the main problems is the Motorola CPU chip which fails, even the newer batch of EIS modules have the same processor fitted so fitting a new module won’t solve the problem entirely, it’s how you look after the vehicle which plays a big part.

Mercedes EIS Fault - Car Won't StartMercedes-Benz EIS / EZS (Electronic Ignition Switch) Module Repairs
We can remanufacture your existing EIS Module unit and save you a lot of money. We thoroughly test & repair all EIS modules to ensure we locate the faults and rectify them completely. When the unit is returned to you, you will not be required to reprogram or re-calibrate the unit – simply plug & play.

After we have repaired your EIS module, you will be able to insert the key, turn the key and start the vehicle with no troubles at all. We do however recommend that you check the battery supply voltage and wiring to the EIS unit prior to installation to ensure there are no faults on the vehicle which could potentially cause failure of the replacement / repaired unit.

All repaired EIS modules are returned with our full Lifetime warranty.
For more information, please call us on 0844 847 9999 or alternatively, send us an email.

Written by Jason

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46 thoughts on “Mercedes EIS / EZS Immobiliser Key Module – Recoding & Repair Service

  1. andrea tonazzini

    hello, i have a problem with the key. locks and unlocks the lock with the button but does not turn. mercedes c 220 cdi w203 year 2001. you can repair?

    Reply
    1. admin Post author

      Hi Andrea

      Thank you for your enquiry,

      We can generally repair these types of faults as we have seen this type of fault before with previous customer units. For a quote, please call our offices on 0844 847 9999 or alternatively you can send us an email.

      Kindest Regards

      Jason
      Support Team
      SINSPEED LTD

      Reply
      1. andrea tonazzini

        Thank you. I think to send the piece. Can you tell me the cost? The EIS can be mounted without other encoding?
        Thanks
        Andrea

        Reply
        1. admin Post author

          Hi Andrea

          Sorry we cannot list prices on the website, please call our offices on 0844 847 9999 or alternatively email us for pricing.

          Kindest Regards
          Jason @ Sinspeed Ltd

          Reply
  2. Chris

    How much to repair my w220 merc esi unit and do you need the key
    Cheers chris

    Reply
    1. admin Post author

      Hi Chris

      We recommend sending both the key and the EIS module so that we can fully test the unit before and after repairs to ensure the unit is fully functional before sending back to you. For pricing, please call us on 0844 847 9999 or email us.

      Kindest Regards
      Jason
      Sinspeed Ltd

      Reply
  3. sagie

    hi, i am looking for a tool to repair eis. what tool do u sell and how much? thanks in advance

    regards sagie

    Reply
    1. admin Post author

      Hi Sagie

      Sorry we don’t offer tools to repair the EIS / EZS device. We offer the repair service. For pricing please call our offices on 0844 847 9999.

      Kindest Regards

      Jason
      Admin Team
      SINSPEED LTD

      Reply
  4. Graham Flowers

    Hi, i have a mercedes Vito 2007, i am experiencing problems with the ignition, i put the key in and the key wont turn in the ignition, and the steering lock remains on, if i press the buttons on the key, sometimes the steering lock will come off, and the radio will come on but the key will not turn the engine . Please can you advise and reply with costings. Many thanks Graham

    Reply
    1. admin Post author

      Hello Graham

      Thank you for your enquiry,

      I’ve sent you an email with information on our repair service and costing. We would need the Electronic steering lock to test as well because it is possible both the EIS module and electronic steering lock can be faulty.

      Kind Regards

      Jason
      SINSPEED

      Reply
  5. M.PATEL

    i have mercedes vito 2008 van i have problem with lock it dosen’t register key or dosen’t unlock steering lock i am not sure what is the problem befoer i sand you my esi unit i need informations very much appreciated

    kinds Regards

    M.patel

    Reply
    1. Jason Post author

      Hello Mohan

      Thank you for your enquiry,

      We would first recommend proper diagnostics to determine whether the key is faulty or the EIS module. Also if you have a 2nd key for the vehicle then try that to see if it is having the same fault. We are able to fully test & repair the EIS modules and request that if you do send it to us, please send with the ignition key so that we can fully test it on our bench to make sure once it is repaired it is fully working before we send it back.

      Kind Regards

      Jason
      SINSPEED

      Reply
    1. Jason Post author

      Hello Khalid

      Thank you for your enquiry,

      We do have tools to make/code keys. For any specific requirement please email us and we will be happy to help you.

      Kind Regards

      Jason
      SINSPEED

      Reply
  6. Kully virdy

    Morning guys I phoned up yesterday to get a cost to repair my EIS on a mercedes w220. I was told someone will phone me back but no one has. I’m after the cost of repairing my existing EIS because according to your response on one of the mercedes forums I just send the switch and keys and you do the rest?.

    Reply
    1. Jason Post author

      Hi Kully

      Really sorry for the late response and nobody getting back to you sooner, we’ve been a little under staffed lately due to senior staff training but we’re back on top of things now. I believe this enquiry has already been dealt with by a colleague of mine last week but if you do have any other queries please don’t hesitate to come back to me.

      Kind Regards

      Jason
      SINSPEED

      Reply
  7. david

    Please send me a quote and info to get my eis repaired. 1998 E320 wagon

    Thanks

    Reply
    1. Jason Post author

      Hello David

      Thanks for the enquiry,

      I’ve sent you an email with pricing and further information.

      Kind Regards

      Jason
      SINSPEED

      Reply
  8. Jas

    I have a 2003 CLK 320 – the battery died I put in a new battery but nothing happens when i turn the key – it wont crank
    I have 2 set of keys tried them both but same thing, the steering lock works as I turn
    the key to ON – I can hear the Fan go thats about it.
    nothing else happen

    is that a ECU issue? how can I confirm if yes how much to fix? and if its not will I still be charged?

    Reply
    1. Jason Post author

      Hello Jas

      Thank you for your enquiry,

      Your vehicle will need diagnostics to confirm which circuit is causing the problem. It may be something as simple as a 20amp fuse for the starter circuit or it could be data loss from the immobiliser module. Without thorough diagnostics it is very hard to say and we won’t be able to quote you on any repairs until we know what part is at fault. Diagnostics is chargeable whether you decide to proceed with repairs or not and I believe this will be the case wherever you go.

      Hope this helps.

      Kind Regards

      Jason
      SINSPEED

      Reply
  9. Simeon Koprivlenski

    Hi ,

    I have a problem with my Merc C200 kompressor 2003 with the ignition switch. Mechanic told me it is not the key neither locking unit or control unit , but electronic ignition unit.
    I can not turn the key on unless i press and hold for a second on “opening ” button of key and than it turns and starts engine. As a results of EIS Failure most electrics in car don ‘t work such as wipers, radio , windows ect. They works if ignition is On, but once engine started they stop.

    Is electronic ignition switch repairable and how much would it cost?

    Thanks

    Simeon

    Reply
    1. Jason Post author

      Hello Simeon

      Thanks for the enquiry,

      That is a common symptom of the EIS failure and we should be able to repair that for you. I have sent you an email with information and pricing.

      Kind Regards

      Jason
      SINSPEED

      Reply
  10. Randy

    Hi . I like to know how much it will cost me fix my EIS (approximately $) from my 2000 s500. I live in Chicago. USA

    Reply
    1. Jason Post author

      Hello Randy

      Thanks for the enquiry,

      I’ve sent you over a quick email with pricing and information regarding the EIS Repair services we offer.

      Kind Regards

      Jason
      SINSPEED

      Reply
  11. Inam

    Hey I have a 2003 s430 w220 in Canada and when the eis is cold it does not start unless I use a heater to heat the car and have taken the eis out in the past when I was stranded without power so I took the eis and heated it with a blow drier and it worked – what would be the cost and procedure to fix it ?

    Reply
    1. Jason Post author

      Hello Inam

      Thank you for your enquiry,

      We’ve sent you a quick email with pricing and information regarding our EIS repair services.

      Kind Regards

      Jason
      SINSPEED

      Reply
  12. Alison

    Hi we have a 2010 220cdi C sport …. The keys both unlock the car and such on all the dash lights but that’s it. If you try a couple of tines it eventually turns over and starts. But each time I think it takes a little longer …. Any ideas

    Reply
    1. Jason Post author

      Hello Alison

      Thank you for your enquiry,

      This is a common sign that the EIS module is about to completely fail, it will take longer and longer each time.
      I’ve sent you an email with pricing and further information regarding the repair services for your EIS module.

      Kind Regards

      Jason
      SINSPEED

      Reply
  13. mick

    hi i have a w208 1998 320clk the ignition key will not turn or release steering lock it was intermitant ,it had been standing for a while and the battery was duff … any idea on the cost of the repairs needed

    cheers mick

    Reply
    1. Jason Post author

      Hi Mick

      Thanks for the enquiry,

      I’ve sent you a quick email with information and pricing as to the repair of your EIS module and also the electronic steering lock. It’s best to send both parts in this scenario as the steering lock unit can also become faulty and we can test & repair this at the same time. Full information is in the email but if you have any further questions then please do come back to me.

      Kind Regards

      Jason
      SINSPEED

      Reply
  14. Sergey

    Hi there, I’ve 2004 vito w639 with EIS problem it wont accept the key when cold and works fine when warm. Just wonder how much will that cost to fix and can that be done if I just send you my EIS and keys
    many thanks

    Reply
    1. Jason Post author

      Hello Sergey

      Thank you for the enquiry,

      We can repair this fault and you can just send the EIS Module + Key for us to complete the repairs. However, we do recommend sending the Electronic Steering Lock as well so that we can test it at the same time for you – but it’s not compulsory. We’ve sent you an email with further information and pricing for the test + repair of your EIS module.

      Kind Regards

      Jason
      SINSPEED

      Reply
  15. michael grayson

    Hi I have a 2002 cl500, the keys will not arm the alarm or operate the central locking. I have been told the EIS could be the problem. Can you test and fix

    regards Mick

    Reply
    1. Jason Post author

      Hello Mick

      Than you for the enquiry,

      We can fully test + repair the EIS module unit. I’ve sent you an email with further information and pricing on our services.

      Kind Regards

      Jason
      SINSPEED

      Reply
  16. Ronnie Oyula

    My wife’s 2007 c350 w204 refused to start. both key and spare key have similar effect. The key turns in the ignition but nothing happens. Locked gear and steering. The battery seems ok because the lights and windows can be run normally using the key, on locking and unlocking. I tried to remove the battery and reconnect, but nothing. Kindly quote for Nije the cost and what you may require to have it fixed. Thanks

    Reply
    1. Jason Post author

      Hello Ronnie

      Thanks for the enquiry,

      We can fully test & repair the EIS module and Electronic Steering lock on your vehicle. We would require you to send us a Single Key, EIS Module and the Electronic Steering Lock so that we can bench test the entire system and return it to you fully functional once repaired. There is no programming required when you receive it back, simply plug & play.

      I have sent you an email with full information as to our repairs, the procedure and a quotation for the cost of our repair services.

      Kind Regards

      Jason
      SINSPEED

      Reply
  17. shah

    Jason,
    My 2008 c180 w204 refused to start. both key and spare key have similar effect.
    this intermittant problem; The key turns in the ignition but nothing happens. Locked gear and steering. The battery seems ok because the lights and windows can be run normally using the key, it start after moving with breaks, hand break and some time bonuts etc.,,
    please advise what do i do and where can get removed this EIS and How to fixed back after your repair. Thanks

    Reply
    1. Jason Post author

      Hello Shah

      Thanks for your enquiry,

      Your symptoms can be the result of an EIS failure but it will need professional diagnostics to confirm the faults. If you remove the EIS module along with your electronic steering lock and send it to us with the key, we can install them on our testing bench and test all units independently to isolate the problem and offer a professional repair. I have sent you an email with full information as to our testing + repair services.

      If you have any further queries, please do come back to me.

      Kind Regards

      Jason
      SINSPEED

      Reply
  18. john sobol

    Hi I am looking for a quote to repair my eis. Neither key will turn in the lock can only assume this is an eis problem although the spare key was working for a short period I find it unlikely both keys would fail in such short proximity to each other. If you could give me a rough price for repair that would be great. The car is a w220 3.2 petrol.

    Reply
    1. Jason Post author

      Hi John

      Thanks for the enquiry,

      We require the EIS module and key to test these units so we can find whether this is a Key or EIS module fault. If you like, you can send both keys to us and we can test both keys together for you. We also recommend sending the ESL (Electric Steering Lock) because when the EIS fails, the ESL normally follows with a failure shortly after.. it’s very common.

      I’ve sent you a quick email with full repair and pricing information and how to send the units to us. If you do require any further information, please do come back to me.

      Kind Regards

      Jason
      SINSPEED

      Reply
  19. CHARLES RANDALL

    I have a 2011 GL 450. The EIS works intermittently the steerin lock never works. Please quote a price on repairing the EIS. Does the inoperative steering lock impact the EIS? What is the typical turn around time for a reconditioned EIS?

    Reply
    1. Jason Post author

      Hello Charles

      Thanks for the enquiry,

      It sounds like you possibly have a faulty ESL (Electronic Steering Lock) and a faulty EIS module. It’s quite common when 1 fails, the other fails shortly after, which would explain why the EIS works intermittently. I expect eventually the EIS will also stop working completely. We can fully bench test & repair both parts and I’ve sent you an email with full pricing and repair information. Our currently turnaround time is 3-5 working days as it gets busier towards Christmas.

      If you have any further queries, please do come back to me.

      Kind Regards

      Jason
      SINSPEED

      Reply
  20. Alan McIvor

    Hello, We have a 2005 Vito with a faulty EIS. This is the second failure in 5 years since having it replaced and re programmed by MB.
    Obviously we are not impressed ,but cutting to the chase, could you enable a repair if the mudule and key is sent to you only.
    We have confirmed the steering lock is functional as it releases when the key is inserted just the start function has now given up after intermitant failures over the last few weeks.
    Please can you also give an approx turn arround also ex works.
    Many thanks

    Reply
    1. Jason Post author

      Hi Alan

      Thanks for the enquiry,

      I agree 2 EIS units to fail in the space of 5 years and the second being a brand new part from MB is definitely not good. We can test + repair the unit for you and I’ve sent you over an email quotation for the repairs. We do ask all customers to send the steering lock with the EIS module and key just so we can test it but if you’re 100% sure it is working correctly then you can leave it out and send only the Key + EIS Module.

      Kind Regards

      Jason
      SINSPEED

      Reply
  21. Rick

    Hi, I have a 2003 vito (115 cdi) I can’t unlock using the remote (main or spare key) and when I put the key in the EIS it simply acts like no key has been inserted, no buzz from steering lock, and won’t allow me to turn the key. This started as an intermittent fault (couple of occasions) and now is permanently stuck like it!

    I have checked fuses (that I can find!) and can’t find any problems there, Central locking still works through the centre console. Lights still work ok… I need my van for work HELP!

    I can easily remove the EIS module, and more than happy to bring it to you instead of posting to help speed things up!

    Can you advise of costs of diagnosis and possible repair costs?

    Thanks

    Reply
    1. Jason Post author

      Hello Rick

      Thanks for the enquiry,

      We can definitely help resolve this issue for you and have sent you an email with further information and possible costs to resolve the problems.

      Kind Regards

      Jason
      SINSPEED

      Reply

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