Remote fob locks but won't unlock.

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Snowyjoey

New Member
Joined
Dec 11, 2023
Messages
3
Location
Surrey, UK
Car
Mercedes E220 2015 Estate
Hello everyone. First post here, so I'll try to be clear (apologies if my question is too long).

I have two keys with remote fobs, both original, for my 2015 E-class e220 estate.
Remote 1 works fine in all regards; locks car, unlocks car, opens tailgate and starts the car.
Remote 2 used to be the same as remote 1. Now, remote 2 locks car, opens tailgate, starts car, but does NOT unlock the car.

Since remote 1 works 100%, it seems unlikely that this is an issue with the vehicle? I've changed the battery in remote 2, but that made no difference. I followed some advice online about re-syncing the key fob to the car (there seem to be a few variations to the procedure out there) but this did not have any effect either.

Any advice on how to solve this without shelling out the kids inheritance on a new key from the main dealer?

Thanks for reading this far :)
 
No need to re-sync a 2015 MY car key. Sounds like the issue is on the key switch for unlocking the car.
 
Hello everyone. First post here, so I'll try to be clear (apologies if my question is too long).

I have two keys with remote fobs, both original, for my 2015 E-class e220 estate.
Remote 1 works fine in all regards; locks car, unlocks car, opens tailgate and starts the car.
Remote 2 used to be the same as remote 1. Now, remote 2 locks car, opens tailgate, starts car, but does NOT unlock the car.

Since remote 1 works 100%, it seems unlikely that this is an issue with the vehicle? I've changed the battery in remote 2, but that made no difference. I followed some advice online about re-syncing the key fob to the car (there seem to be a few variations to the procedure out there) but this did not have any effect either.

Any advice on how to solve this without shelling out the kids inheritance on a new key from the main dealer?

Thanks for reading this far :)
Possibly the unlock switch on the fob has failed. If you’re good with a soldering iron it’s a diy job with a new switch from eBay, if not, a car key specialist will be able to do it. For example :

 
Had the same problem on a W204 key fob some years ago. Dismantled the key & sprayed the faulty switch with IPA (Isopropyl alcohol) which can be used for electrical contact cleaning. Then operated the switch a number of times, problem solved. Was still working fine some years later when I sold the car. Might be worth a try.
 
Cannot recommend 'Car Key solutions' enough!
When I bought the car, it only had x1 key (negoiated into purchase price) however, my concern was security (what if the 2nd key was still 'active'?) These guys were brilliant. First came to house to collect 'ionfo' from car. Then key ordered from Germany and programmed to suit, which also 'deletes' any previous keys, rendering them useless. Whole deal was £410, but may be cheaper for different models? Just Google 'Carkeysolutions' if needed!
 

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