Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi, my name is Marty.
This problem is caused by a bad K40 relay. The relay is located under the hood inside the module box.
Often times you can open the module box and tap on the relay while a helper turns the key to start the car. If you have no success you will need to replace the relay. The part number of the relay is 210 540 00 72. Click on the attachment for a picture of the relay.
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