JC Cars (Home of ECU Connection) - 143 C&D Sprowston road, Norwich NR3 4QQ Tel: Office: (01603) 733863 / Workshop - (01603) 784111




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You can now view & place orders for all of our programming services - you can also search our database of thousands of ECUs, BCMs, Clusters etc for sale

Mercedes Diagnostics

 We regularly undertake vehicle diagnostics and specialist electronic repairs including electronic control module replacement to Mercedes vehicles. If you have an ECU fault with your Mercedes you will be aware that you cannot simply replace your faulty ECU with a secondhand unit as they are programmed (Locked) to your immobiliser system. However we are able to re-program a secondhand ECU by transferring the data files from your original faulty unit. This is known as 'Bench programming' or 'cloning' the donor unit will then simply 'plug & play' with no further programming necessary using your original keys and displaying its correct mileage. We have hundreds of ECU's in stock, please call us to see if we have a compatible unit for your vehicle available. If we don't have a unit in stock or if you have already purchased a secondhand unit & need us to program it to your car we offer an ECU 'cloning' service. ECU cloning starts at 50+vat - Call us for more information and advice on how we can help you with your requirements.
Mercedes ECU programming

Mercedes ECU's we regularly program

Siemens 5WK9 Series

Bosch CR2 series

Bosch CRA series

Bosch ED6 series

Delphi CRD series

Siemens 5WK series

VDO MSM Series


Mail order service available

Mercedes Key programming


 Remote keys & Infra red keys (IR keys) now supplied & programmed for Mercedes cars & vans!
Please call for full info & prices - if you are looking for a duplicate key or have lost you mercedes car or van key we can program a new one to you vehicle - Express service available (Same day), unlike main dealers that have to order a key from Germany which can take over a week to arrive! Also to note our keys are made from the immobiliser on your vehicle - Replacement keys supplied from main dealer are made from chassis number, so if for any reason your car has had an 'ECU kit' fitted from a secondhand vehicle in the past the main dealer key will not work - ours will! Mail order service is available for most model Mercedes vehicles - Please check the list below, if your model is listed as 'Lost key - Yes' then we can make a key without the need for the vehicle to be present for programming - all we need is the 'EIS' (Electronic ignition switch) removed from the vehicle & sent to us - If you prefer you can bring the vehicle to us at our workshop in Norwich to have a new key programmed to your Mercedes vehicle

Model Chassis Type Model Year Add Key Lost Key
A-Class W169 2004-2011 Yes Yes
B-Class W245 2005-2011 Yes No
C-Class W203 2003-2007 Yes Yes
CLK-Class W208 2001-2002 Yes Yes
CLK-Class W209 2003-2008 Yes Yes
C-Class W202 1997-2002 Yes Yes
C-Class W204 2007-2011 Yes No
E-Class W210 2001-2002 Yes Yes
E-Class W211 2002-2007 Yes Yes
E-Class W212 2009-2010 Yes No
CLS-Class W219 2004-2009 Yes No
S-Class W220 2001-2005 Yes Yes
S-Class W221 2005-2011 Yes No
CL W215 2001-2006 Yes Yes
CL W216 2005-2011 Yes No
SL R230 2001-2009 Yes No
SLK R171 2004-2009 Yes No
G-Class W463 2002-2011 Yes No
R-Class W251 2005-2010 Yes No
M-Class W164 2005-2010 Yes No
GL-Class X164 2006-2010 Yes No
Vito/Viano/Vaneo W639 2004-2012 Yes Yes
Sprinter W906 2005-2012 Yes Yes

We have recently added a new key programming tool to our inventory & can now do even more Mercedes keys than those listed above!
Please call for further details!

Mail order service available

Mercedes ESL Emulators

For info on ESL

 Many Mercedes model cars suffer from failing Electronic Steering Locks or more commonly known as 'ESL' - replacement ESL units are very costly & require specialist tools to program them to your car if they are W204 / W207 or W212 models, a simple alternative is to disconnect the ESL & fit an emulator. The emulators for these models still require programming to your vehicle but are a fraction of the cost of replacing the ESL with a new one. All you need to do is remove the 'EIS' (Electronic Ignition switch) & send it to us along with a working key for your car & we will program an emulator that will plug into your existing wiring with no need for further programming thus eliminating the need to replace the ESL. In some cases the ESL will be jammed in the 'Locked' position, if you cannot remove it yourself then you can send us the column with the jammed lock & we can remove it for you.
 Common symptoms of a failed ESL is that the key will turn in the EIS but no ignition lights come on, the car does not crank & there isn't the familiar noise of the steering lock disengaging, there may be a fault code stored in the EIS of 'Fault with or No comms with ESL' but not always

Mail order service available

Mercedes ISM Programming

 The Mercedes 'ISM' unit (Intelligent Servo module) sometimes known as the Automatic gearbox ECU regularly fail on W221 and other models, it is not possible to simply replace this unit with a second-hand unit as they are programmed or 'locked' to the vehicle they are fitted to, don't worry - if you are looking for how to replace an ISM on a Mercedes then you have came to the right place as we have the solution! - we can transfer the vehicle data from your original ISM unit to a donor unit enabling the car to start & run again - this process is called 'cloning', simply send us your original ISM & a donor unit with a matching part number & we will have the data transferred and back to you within a few days - please call for further information,

Mail order service available

Mercedes Airbag Crash data removal & programming

 We can remove crash data from most airbag control units fitted to Mercedes vehicles. Crash data needs to be removed from SRS control units after a car has had collision and a safety feature has been activated such as seat belt pre-tensioners, airbags, fuel cut-off systems etc. This usually appears as the airbag warning light being illuminated and fails to extinguish when garages try to clear fault codes with a standard diagnostic scanner. Simply remove your airbag control unit, bring it to us for stripping and re-programming and usually it will be ready for collection within 24 hours. Crash data removal starts from 40+vat - We can also re-program secondhand Mercedes Airbag ECU's - If you have purchased a secondhand Mercedes airbag ECU from a breakers yard / Ebay etc you will be aware that the chassis number is programmed to the unit 'locking' it to the car it came from - we can reprogram this enabling it to be re-used in a different vehicle, please call for more info

Mail order service available

Ebay shop

 We have large stocks of Mercedes 'Plug & Play' ECU for sale - tested & warranted for 3 months. Fast mail order throughout Europe! Call us anytime or check out our items on Ebay. We accept Paypal & card payments. For fast overnight delivery & information on our latest stock not listed on Ebay please call us...

Mail order service available



Full or part Payments accepted on vehicle purchases & servicing with credit & debit cards


(01603) 784111 - (07799) 492517

 Car keys Norwich - Car keys Kent - Car diagnostics Norwich - Car repairs Norwich

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- Mobile key cutting / Auto locksmith service available -

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