E-Class (W212) 2010 - 2016: E 350, E 550

Both key fobs bad???

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Old 12-17-2017, 11:46 AM
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2012 E350 Coupe
Both key fobs bad???

OK so my car is telling me "replace key fob battery" which of course I've done. Energizer 2025 in both! Doesn't help. They work intermittently. Frequently I have to click the button to lock and unlock the doors. It doesn't recognize my touch.

Could I have a bad receiver on the car? I searched but didn't find much besides a lot of battery advice. But I've changed them twice and I took one set to WM and they tested fine.

Ideas?
Old 12-17-2017, 01:12 PM
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2008 E350 4Matic, 2011 E350 4matic
Where did you get the batteries and what's the voltage on the batteries? Some fake knock off ones aren't very good and the ones sitting around at the local store may have lost their charge. Brand new mine tests out at about 3.31 volts and when I get the battery fob message they're down to about 3.06.
Old 12-17-2017, 01:15 PM
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'71 Pinto
Make sure surfaces are free from lint, grease and all other contamination also try carefully bending metal tabs where battery sits message should go away if there is proper voltage. If not, need to have dealer check keys/system.
Old 12-17-2017, 11:00 PM
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2010 e550 p2
Weak aux battery?
Old 12-17-2017, 11:11 PM
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2003 CL55AMG
check batteries on remote, 12volt front and rear batteries in the car. If these steps does not fix the issues , than take the car to the dealership for service.

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