One of the main problems is the CPU chip inside fails or for example crashes just like a computer or PC. At this point most people will advise you to purchase a new ignition unit which can work out extremely expensive. Some of the most common reasons are listed below:Īll of the above can cause memory loss or corruption of the EIS module and it cannot be repaired or re-flashed using the usual Mercedes diagnostic systems. It is very unfortunate but also a very common problem as there are many reasons as to why these units fail. If the EIS unit becomes faulty, the key will not turn & start the engine, this function will be de-activated and the module will be locked for security purposes. Mercedes EIS / EZS Immobiliser Key Module Problems and Repairs Please note that prices are from £150 depending on the exact fault we find, price may be more Please watch our video which explains to you how to remove the EIS unit from your car. One of the most common faults is that the EIS no longer recognizes the key, this prevents you from turning the key and starting the engine. When the steering lock fails, the key turns the ignition, but it will not start the engine.
No need to replace your EIS at a great cost, we can save you money. Mercedes-Benz Ignition Lock ESL Problems. We will need you to also send all keys you have for the vehicle with the unit. You will need to remove and send us your ignition unit and we will diagnose and repair any fault you may have with it. Mercedes Benz W639 EIS cables overview: The Mercedes W203 EIS testing cable is a multi-option testing cable, Thanks to the switch on it, the MB W203 EIS cable enables you to read the EIS data by OBD, Read the EIS data by IR & Calculate the password for all keys lost using the fast password calculation method. This is a repair service for all Mercedes Benz electronic ignition units, also known as EIS/EZS unit.
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