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post #2 of (permalink) Old 23rd October 2009
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the key is made up of 2 parts. The remote side and the transponder side which opperates the immobiliser.

The code for the immobiliser is stored in a box ( uch or bmt) under the pass side dash. When you try to start the car it is compared with the number stored in the ECU under the bonnet. If they agree the car is allowed to crank the engine and start.

The flashing light on the dash should go solid then go out if the immobiliser is opperating correctly. If it flashes fast the immobiliser is active as the proceedure has failed.

If the ecu has failed a second hand unit can be purchased for about 100 ready to learn the next car it is plugged into. This will only cure your problem if it is the part that is faulty on your car.
If the garage is wrong it still will not start.
Currently in Hopless's garage:
Mercedes pagoda W113
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