25 Nov, 12

Mercedes EIS Repair – EZS Immobiliser Key Module – ESL + KEY Repair Service

Sinspeed EIS Repair Services

Mercedes EIS ProblemsWelcome to Sinspeed’s Mercedes-Benz EIS Repair Service. We specialise in repairing and replacing faulty EIS units for Mercedes-Benz vehicles. Our team of experienced technicians have years of experience in diagnosing and repairing EIS units, and we use only the latest diagnostic equipment and software to ensure that your EIS unit is repaired to the highest standard. Furthermore, we extend our service to the testing and repair of the Mercedes-Benz ESL (Electronic Steering Lock) and Key too!

What Is An EIS & How Does It Work?


The Electronic Ignition Switch (EIS) is a vital component in the Mercedes-Benz vehicle’s security system. It is responsible for controlling the vehicle’s immobiliser, which prevents the engine from starting without the correct key. The EIS is also responsible for controlling other security features such as the central locking system and the alarm.

The EIS works by communicating with the key through a transponder chip. When the key is inserted into the ignition, the EIS sends a signal to the key, which responds with a unique code. If the code matches the one stored in the EIS, the immobiliser is deactivated, the ESL (Electronic Steering Lock) is disengaged and the engine can be started. If the code does not match, the immobiliser remains active, and the engine will not start.

The EIS is a complex system that requires specialised knowledge and equipment to diagnose and repair. If the EIS is faulty, it can cause a range of issues, including the engine not starting, the central locking system not working, and the alarm not arming or disarming. In such cases, our highly experienced technicians are at hand to extensively test and repair all types of EIS and ESL failures.

Which Model Mercedes Has The EIS Module

Mercedes-Benz EIS / EZS Testing + Repairs
The EIS module is factory fitted to almost all models and we’re getting units sent in right across the board, in fact Mercedes-Benz vehicles from the C-Class, E-Class, S-Class, CLS-Class, CLK-Class, CL-Class, ML-Class, GL-Class, R-Class, SL-Class, and SLK-Class are all fitted with the Electronic Ignition Switch (EIS) system. You can expect the EIS module to be supported and installed on the following Chassis list:

W164 / W168 / W169 / W202 / W203 / W204 / W208 / W209 / W210 / W211 / W212 / W215 / W219 / W220 / W221 / W230 / W639

Below we have compiled an extensive list of vehicles which we have already seen fitted with the EIS and have had units in for repairs. Don’t worry if your vehicle is not listed as this is not a complete list.

MakeChassisModelEngineEngine CodeFuelYear (From)
MercedesW168A1601700 CDiOM668DE17ARDiesel1998
MercedesW168A1601700 CDiOM668DE17LARDiesel2001
MercedesW168A1701700 CDiOM668DE17LADiesel1998
MercedesW168A1701700 CDiOM668DE17LADiesel2001
MercedesW169A1501500 16vM266E15Petrol2004
MercedesW169A1601500 16v BlueEfficiencyM266E15Petrol2004
MercedesW169A1602000 CDiOM640DE20LARDiesel2004
MercedesW169A1602000 CDi BlueOM640DE20LARDiesel2009
MercedesW169A1701700 16vM266E17Petrol2004
MercedesW169A1802000 CDiOM640DE20LARDiesel2004
MercedesW169A2002000 16vM266E20Petrol2004
MercedesW169A2002000 16v TurboM266E20ALPetrol2005
MercedesW169A2002000 CDiOM640DE20LADiesel2004
MercedesW202C2002000 16vM111E20Petrol1996
MercedesW202C2002000 16v KompressorM111E20MLPetrol1996
MercedesW202C2002200 CDiOM611DE22LARDiesel1998
MercedesW202C2202200 CDiOM611DE22LADiesel1998
MercedesW202C2302300 16v KompressorM111E23MLPetrol1996
MercedesW202C2402400 V6M112E24Petrol1997
MercedesW202C2802800 V6M112E28Petrol1997
MercedesW202C434300 V8 AMGM113E43Petrol1997
MercedesW202C555500 V8 AMGM113E55Petrol1998
MercedesW203C1801800 16v KompressorM271E20Petrol2002
MercedesW203C1802000 16vM111E20EPetrol2000
MercedesW203C2001800 16v KompressorM271E18MLPetrol2002
MercedesW203C2001800 CGi 16v KompressorM271DE18MLPetrol2003
MercedesW203C2002000 16v KompressorM111E20MLPetrol2000
MercedesW203C2002200 CDiOM611DE22LARDiesel2000
MercedesW203C2002200 CDiOM646DE22LADiesel2003
MercedesW203C2002200 CDiOM646DE22LARDiesel2003
MercedesW203C2202200 CDiOM611DE22LADiesel2000
MercedesW203C2202200 CDiOM646DE22LADiesel2004
MercedesW203C2301800 16v KompressorM271E18MLPetrol2004
MercedesW203C2302500 V6M272E25Petrol2005
MercedesW203C2402600 V6M112E26Petrol2000
MercedesW203C2702700 CDiOM612DE27LADiesel2000
MercedesW203C2803000 V6M272E30Petrol2005
MercedesW203C303000 CDi AMGOM612DE30LADiesel2003
MercedesW203C323200 V6 AMGM112E32MLPetrol2001
MercedesW203C3203000 CDiOM642DE30LADiesel2005
MercedesW203C3203200 V6M112E32Petrol2004
MercedesW203C3503500 V6M272E35Petrol2005
MercedesW203C555500 V8 AMGM113E55Petrol2004
MercedesW203CLK2001800 CGi 16v KompressorM271DE18MLPetrol2003
MercedesW204C1801800 16v KompressorM271KE18MLRPetrol2007
MercedesW204C1802200 CDi BlueOM651DE22LARDiesel2010
MercedesW204C2001800 16v KompressorM271E18MLPetrol2007
MercedesW204C2001800 CDi BlueOM651DE18LADiesel2008
MercedesW204C2002200 CDi BlueOM651DE22LARDiesel2009
MercedesW204C2202200 CDiOM651DE22LADiesel2008
MercedesW204C2202200 CDiOM651DE22LADiesel2011
MercedesW204C2202200 CDiOM651DE22LARDiesel2007
MercedesW204C2202200 CDiOM651DE22LARDiesel2007
MercedesW204C2202200 CDi BlueOM651DE22LADiesel2009
MercedesW204C2302500 V6M272KE25Petrol2007
MercedesW204C2502200 CDi BlueOM651DE22LADiesel2008
MercedesW204C2502200 CDi BlueOM651DE22LADiesel2011
MercedesW204C2803000 V6M272KE30Petrol2007
MercedesW204C3003000 CDi BlueOM642DE30LADiesel2011
MercedesW204C3003000 V6M272KE30Petrol2009
MercedesW204C3203000 CDiOM642DE30LADiesel2007
MercedesW204C3503000 CDiOM642DE30LADiesel2009
MercedesW204C3503000 CDi BlueOM642DE30LADiesel2009
MercedesW204C3503000 CDi BlueOM642LSDE30LADiesel2011
MercedesW204C3503500 V6M272KE35Petrol2007
MercedesW204C3503500 CGi V6 BlueM272DE35Petrol2008
MercedesW219CLS2803000 V6M272E30Petrol2008
MercedesW219CLS3003000 V6M272E30Petrol2009
MercedesW219CLS3203000 CDiOM642DE30LADiesel2004
MercedesW219CLS3503000 CDiOM642DE30LADiesel2008
MercedesW219CLS3503500 V6M272E35Petrol2004
MercedesW219CLS5005000 V8M113E50Petrol2004
MercedesW219CLS5005500 V8M273E55Petrol2006
MercedesW219CLS55 AMG5500 V8 KompressorM113KE55Petrol2004
MercedesW210E2002000 16vM111E20Petrol1995
MercedesW210E2002000 16v KompressorM111E20MLPetrol1997
MercedesW210E2002000 16v Kompressor EVOM111E20EVOPetrol2000
MercedesW210E2002200 CDiOM611DE22LARDiesel1998
MercedesW210E2002200 CDiOM611DE22LARDiesel1999
MercedesW210E2202200 CDiOM611DE22LADiesel1998
MercedesW210E2202200 CDiOM611DE22LADiesel1999
MercedesW210E2402400 V6M112E24Petrol1997
MercedesW210E2402600 V6M112E26Petrol2000
MercedesW210E2702700 CDiOM647DE27LADiesel1999
MercedesW210E2802800 V6M112E28Petrol1997
MercedesW210E3203200 CDiOM613DE32LADiesel1999
MercedesW210E3203200 V6M112E32Petrol1997
MercedesW210E4204200 V8M119E42Petrol1996
MercedesW210E4304300 V8M113E43Petrol1997
MercedesW210E5005000 V8M119E50Petrol1996
MercedesW210E555500 V8 AMGM113E55Petrol1997
MercedesW210E606000 V8 AMGM119E60Petrol1996
MercedesW211E2001800 16v KompressorM271E18MLPetrol2003
MercedesW211E2001800 16v KompressorM271E18MLPetrol2006
MercedesW211E2002200 CDiOM646DE22LARDiesel2003
MercedesW211E2002200 CDiOM646DE22LARDiesel2006
MercedesW211E2202200 CDiOM646DE22LADiesel2002
MercedesW211E2202200 CDiOM646DE22LARDiesel2006
MercedesW211E2202200 CDiOM646DE22LARDiesel2007
MercedesW211E2402600 V6M112E26Petrol2002
MercedesW211E2702700 CDiOM647DE27LADiesel2002
MercedesW211E2803000 CDiOM642DE30LARDiesel2006
MercedesW211E2803000 V6M272E30Petrol2005
MercedesW211E2803200 CDiOM648DE32LARDiesel2005
MercedesW211E3203000 CDiOM642DE30LADiesel2005
MercedesW211E3203200 CDiOM648DE32LADiesel2003
MercedesW211E3203200 V6M112E32Petrol2002
MercedesW211E3503500 V6M272E35Petrol2005
MercedesW211E4204000 CDiOM629DE40LADiesel2006
MercedesW211E5005000 V8M113E50Petrol2002
MercedesW211E5005500 V8M273E55Petrol2006
MercedesW211E55 AMG5500 V8M113E55MLPetrol2003
MercedesW164ML2803000 CDiOM642DE30LARDiesel2005
MercedesW164ML3003000 CDiOM642DE30LARDiesel2009
MercedesW164ML3003000 CDiOM642DE30LARDiesel2010
MercedesW164ML3203000 CDiOM642DE30LADiesel2005
MercedesW164ML3503000 CDiOM642DE30LADiesel2009
MercedesW164ML3503000 CDiOM642DE30LADiesel2010
MercedesW164ML350 BlueTec3000 CDiOM642DE30LADiesel2009
MercedesW164ML3503500 V6M272E35Petrol2005
MercedesW164ML4204000 CDiOM629DE40LADiesel2005
MercedesW164ML5005000 V8M113E50Petrol2005
MercedesW164ML5005500 V8M273KE55Petrol2008
MercedesW164ML63 AMG6200 V8M156E63Petrol2006
MercedesW220S2802800 V6M112E28Petrol1998
MercedesW220S3203200 CDiOM613DE32LADiesel1999
MercedesW220S3203200 CDiOM648DE32LADiesel2002
MercedesW220S3203200 V6M112E32Petrol1998
MercedesW220S3503700 V6M112E37Petrol2002
MercedesW220S4304300 V8M113E43Petrol1998
MercedesW220S4304300 V8M113E43Petrol2003
MercedesW220S5005000 V8M113E50Petrol1998
MercedesW220S5005000 V8M113E50Petrol2003
MercedesW220S55 AMG5500 V8M113E54Petrol1999
MercedesW220S55 AMG5500 V8 KompressorM113E54MLPetrol2002
MercedesW220S600 TwinTurbo5500 V8M275KE55LAPetrol2002
MercedesW220S65 TwinTurbo AMG6000 V12M275KE60LAPetrol2004
MercedesW221S3003000 V6M272E30Petrol2006
MercedesW221S3203000 CDiOM642DE30LADiesel2006
MercedesW221S350 Blue3000 CDiOM642DE30LADiesel2009
MercedesW221S350 BlueTec3000 CDiOM642DE30LADiesel2009
MercedesW221S3503500 V6M272E35Petrol2006
MercedesW221S400 Hybrid3500 V6M272E35Petrol2009
MercedesW221S4204000 CDiOM629DE40LADiesel2006
MercedesW221S4504600 V8M273E46Petrol2006
MercedesW221S500 TwinTurbo Blue4600 V8M278DE46ALPetrol2011
MercedesW221S5005500 V8M273E55Petrol2005
MercedesW221S600 TwinTurbo5500 V12M275KE55LAPetrol2006
MercedesW221S63 TwinTurbo AMG5500 V8M157DE55LAPetrol2010
MercedesW221S65 TwinTurbo AMG6000 V12M275KE60LAPetrol2006
MercedesW639Viano V2002000 16vM111E20Petrol1999
MercedesW639Viano V2002200 CDiOM646DE22LADiesel2003
MercedesW639Viano V2002200 CDiOM646DE22LADiesel2006
MercedesW639Viano V200 Blue2200 CDiOM651DE22LARDiesel2010
MercedesW639Viano V2202200 CDiOM646DE22LADiesel2003
MercedesW639Viano V3003000 CDiOM642DE30LADiesel2006
MercedesW639Viano V3203200 V6M112E32Petrol2003
MercedesW639Viano V3503500 V6M272E35Petrol2007
MercedesW639Viano V3503700 V6M112E37Petrol2004
MercedesW639Vito 1092200 CDiOM646DE22LARDiesel2003
MercedesW639Vito 1092200 CDiOM646DE22LARDiesel2006
MercedesW639Vito 1112200 CDiOM646DE22LADiesel2003
MercedesW639Vito 1112200 CDiOM646DE22LADiesel2006
MercedesW639Vito 111 Blue2200 CDiOM651DE22LARDiesel2010
MercedesW639Vito 1152200 CDiOM646DE22LADiesel2003
MercedesW639Vito 1203000 CDiOM642DE30LADiesel2006
MercedesW639Vito 1223200 V6M112E32Petrol2003
MercedesW639Vito 1233500 V6M272E35Petrol2007
MercedesW639Vito 1233700 V6M112E37Petrol2004

Common EIS Problems

Like any other electronic component, the EIS unit is prone to faults and failures. Here are some of the common problems people experience with the Mercedes-Benz EIS unit:

  • Failed Ignition: One of the most common issues with the EIS unit is a failed ignition. This can be caused by a faulty key, a damaged EIS unit, or a problem with the wiring.
  • Key Not Turning: Another common issue is when the key does not turn in the ignition. This can be caused by a worn-out key, a damaged EIS unit, or a problem with the steering lock.
  • Immobiliser Failure: The EIS unit is responsible for controlling the immobiliser, which prevents the car from starting without the correct key. If the immobiliser fails, the car will not start, and the EIS unit may need to be repaired or replaced.
  • Keyless Entry Failure: The EIS unit is also responsible for controlling the keyless entry system. If the keyless entry system fails, the car may not unlock or lock properly, and the EIS unit may need to be repaired or replaced.

In conclusion, the Mercedes-Benz EIS unit is a critical component of the car’s security system, and any faults or failures can cause significant problems. If you experience any of the above issues, it is essential to have your EIS unit checked by a professional.

In some cases, a failing EIS or ESL can be the result of either human error or another fault on the vehicle and 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.

Sinspeed EIS Repair Service

Mercedes EIS Fault - Car Won't Start

When it comes to a faulty EIS (Electronic Ignition Switch) unit in a Mercedes-Benz, it is often better to repair it rather than replace it with a new part. This is because the EIS unit is a complex component that is linked to other systems in the car, such as the immobiliser and keyless entry.

Replacing the EIS unit with a new one can be expensive and time-consuming, as it requires reprogramming the keys and other systems. Additionally, a new EIS unit may not be available for direct purchase and special order items can cause further significant delays in getting your vehicle back on the road.

At Sinspeed, we offer a comprehensive EIS repair service that covers all aspects of diagnosing and fixing faults with your EIS unit. Our service includes:

  • Diagnosing the fault with your EIS unit: Our experienced technicians use the latest state-of-the-art technology and leading diagnostic equipment to identify the root cause of the problem with your EIS unit. We’re able to fully communicate with the unit on our test bench, power it up and simulate it as if it were operating on your vehicle, allowing us to confirm faults and identify the root cause of any failures.
  • Repairing or replacing faulty components: We use genuine OE components to repair or replace any faulty parts in your EIS unit, and where possible, uprate components to eliminate any known weaknesses and ensure that it is restored to full working order.
  • Recoding the EIS unit to work with your existing keys: We can recode your EIS unit to work with your existing keys, saving you the cost and hassle of having to replace them or have them reprogrammed.
  • Testing the EIS unit to ensure that it is functioning correctly: After completion of the EIS Repair, we rigorously test your unit to ensure that it is functioning correctly before returning it to you.
  • Lifetime warranty for complete peace of mind: We offer a lifetime warranty on all of our EIS repairs, giving you complete peace of mind that your EIS unit is in safe hands.

EIS Replacement Options

When it comes to the Mercedes EIS, it is a common failing part that can cause a lot of frustration for vehicle owners. While repairing the original part is often the best option, there are times when a replacement may be necessary.

At Sinspeed, we understand the importance of using genuine parts and repairing components whenever possible – not only does it reduce complications on the vehicle but we should all do our part to be carbon-neutral. That’s why we always recommend trying to repair the original EIS before considering a replacement. Not only is this the most cost-effective option, but it also ensures that the vehicle is using the part that was specifically designed for it.

However, there are situations where a replacement may be necessary. In these cases, we offer high-quality replacement parts that are fully compatible with the vehicle. Our team of experts can program the replacement part so that there is no need for any recoding when it is re-installed back on the vehicle. This makes the replacement process quick and easy and ensures that the vehicle is back on the road as soon as possible.

Any replacements offered will be genuine parts that meet and exceed OE specifications. This ensures that the replacement part will perform just as well as the original, and will provide reliable service for years to come. In fact, it will also be covered by the Sinspeed Lifetime Warranty for complete peace of mind.

At Sinspeed, we pride ourselves on our expertise and attention to detail when it comes to EIS repairs. Our technicians have years of experience in working with Mercedes-Benz vehicles, and we use only the latest diagnostic equipment and genuine OE components in our repairs. So if you’re experiencing issues with your EIS unit, get in touch with us today to see how we can help.

Commonly Asked Questions

  • What if it is my ESL or Key that’s faulty – What should I do?
    We always recommend sending all three parts to us so that we can independently test the units and also test them in circuit alongside each other. We can remanufacture all three parts if required and any repaired units are returned with a Lifetime warranty for complete peace of mind.
  • Will Mercedes EIS programming be required?
    No – we backup all the programming data before remanufacturing the units. Our remanufactured units are returned fully plug & play and will self-calibrate when fitted back to the vehicle.
  • Can you offer a Mercedes EIS replacement?
    Certainly – if your unit is for any reason beyond repair, we can offer a replacement unit and program it on our bench so that no further coding is required when fitting to the vehicle.
  • I’ve been told my model of Mercedes does not have an ESL?
    Not all Models are fitted with an ESL, some models are controlled through the auto gearbox system and in such cases we will only require the EIS and ignition Key.
  • Do you have a Mercedes EIS removal guide?
    No – we do not offer any removal / fitting instructions and always recommend that the removal and fitting is carried out by a competent technician.

Check out our list of the most common part numbers below. Don’t worry if your part number is not listed, this is not a complete list and there are many more we have seen and successfully repaired.

Part NumbersPart NumbersPart Numbers
3300.0301210 545 02 08 Q5639 545 01 08
3300.2301210 545 00 084033861060206133
3300.0201215 545 02 08639 545 05 08
3300.22.05211 545 10 088000305550206123
3300.1109215 545 08 082035869051606106
3300.2418209 545 19 086014913971606128

Tags : 2095451908, 2105450008, 2105450208Q5, 2115451008, 2155450208, 2155450808, 3300.0201, 3300.0301, 3300.1109, 3300.22.05, 3300.2301, 6395450108, 6395450508, Mercedes W203 EIS Module Faults - Car Won't Start, Mercedes W203 EIS Module Repairs, Mercedes W208 EIS Module Faults - Car Won't Start, Mercedes W208 EIS Module Repairs, Mercedes W209 EIS Module Faults - Car Won't Start, Mercedes W209 EIS Module Repairs, Mercedes W210 EIS Module Faults - Car Won't Start, Mercedes W210 EIS Module Repairs, Mercedes W211 EIS Module Faults - Car Won't Start, Mercedes W211 EIS Module Repairs, Mercedes W215 EIS Module Faults - Car Won't Start, Mercedes W215 EIS Module Repairs, Mercedes W219 EIS Module Faults - Car Won't Start, Mercedes W219 EIS Module Repairs, Mercedes W220 EIS Module Faults - Car Won't Start, Mercedes W220 EIS Module Repairs, Mercedes W230 EIS Module Faults - Car Won't Start, Mercedes W230 EIS Module Repairs.
556 thoughts on “Mercedes EIS Repair – EZS Immobiliser Key Module – ESL + KEY Repair Service
  • I have a 2008 c300 sedan. The key unlocks/locks the doors, but it will not start the car, and the steering wheel is locked. Was told it was the EIS, the key is worn and I only have one. What can you do to remedy this? Can I get another key when you repair this switch?

    • Hello Bill

      Thank you for your enquiry,

      We have sent you an email with full details and pricing.

      Kind Regards


  • I have a 2005 Mercedes SLK 200. It wont start, all the warning lights come up but on the Ignition phase There is nothing. The electric Fan starts up and goes to maximum which us very Unnerving. I only have the one key.

    • Hello Graham

      Thank you for your enquiry,

      We have sent you an email with full details and pricing.

      Kindest Regards


  • I Have a Mercedes Vito w639. Key won’t turn in ignition. Have recently jumped started couple of times and replaced key fob shell.

    I dont know If ive damaged key Replacing shell or EIS unit through flat battery/ jump start with key in ignition. Also need spare key?

    Thanks in advance

    • Hello Mike

      Thank you for your enquiry,

      We have sent you an email with more details and pricing.

      Kindest Regards


  • i have a mercedes 2006 with steering lock issues.
    Can you call me please on 0***** to discuss

    Many thanks
    Ronald reid

    • Hello Ronald

      Thanks for getting in touch,

      We have sent you an email with full details and pricing.

      Kindest Regards


  • Hi I have a w220 my 2000 and have a problem where I can’t rotate the key once inserted into the EIS unit. I have correct main battery voltage and even changed the battery just in case. the car unlocks with the remote . any idea if this could be repaired ? if so an estimate for repair would be appreciated.

    • Hello Paul

      Thank you for your enquiry,

      We have sent you an email with full details and pricing.

      Kindest Regards


  • Hi, I have a s500 from 2000. The key doenst turn anymore but the key still opens the doors with the buttons. The steering wheel lock is not engaged. Any tips?

    • Hey there!
      Thanks for reaching out. Your enquiry has been forwarded to the relevant department & they will reach out to you soon via email.


  • 2001 C270 ..Key does not turn at all. Remote locking still Functioning. Steering lock not engaged. Fully charged battery. Three keys Available, none recognised. Estimate required for repair please.

    • Hey Richard!!

      Thank you for reaching out to us!

      I’ve passed along your inquiry to the appropriate department, and they will be in touch with you via email soon.


  • i have a sl55 amg both keys wont turn in eisdont know if its keys or eis

    • Hey there, Martin!
      Thanks for getting in touch!

      Your question has been sent to the right department, and they will be in touch with you soon via email.

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