Join Date: Oct 2009
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save your money, don't buy a used key.
There are 2 possibilities on this year an IR key or a RF key
basicaly radio or infra red.
If the key has what looks like a little bulb pionting in the same direction as the balde its IR. If it flashes red twice on one of the sides its radio.
The IR (isuspect this is your type) has a transponder chip which controls the immobiliser and a remote control for the central locking. This type of key has to pionted to a receiver near the rear view mirror.
Try re-sincing the keu by holding the remote button on the car until it clicks twice, then push the remote twice.
Currently in Hopless's garage:
Mercedes pagoda W113