defective key
Thread Starter
Junior Member
Joined: Jul 2017
Posts: 20
Likes: 0
2010 C200 cgi avantgarde1.8T
defective key
My original key went dead some time ago. Now I have a problem with my spare key. There is no IR light emitting from the key fob, so the doors or windows are not responding, Thankfully, the key starts the car and and the door knobs are all operative. Any DIU suggestions here. I have a new and tested battery in the fob.
Junior Member
Joined: Jul 2021
Posts: 30
Likes: 1
From: South west england
w204
I had similar and went to a Merc dealer, they asked me if I bought a genuine Merc battery …….NO, but a good make, I said. they sold me a “Merc” battery and it worked ok. Buggered if I know why🤷♂️
