2007 Mercedes Benz E550 smart key starting issue?
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Junior Member
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2007 Mercedes Benz E550
2007 Mercedes Benz E550 smart key starting issue?
I just this past weekend got a 2007 mb e550. One time when going to start it today I turned the key and the engine didn't turn over and all the dash lights turned on, all of them... I took the key out and flipped it around (lock/unlock buttons facing steering wheel instead of passenger door) and it turned over and started right away. Does the direction of the key matter? Is the battery in the smart key low? Did I maybe just not push it in the ignition enough the first time? Any advice appeciated !! Thanks!
Senior Member
Joined: Oct 2011
Posts: 314
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From: Coastal Georgia, USA
2007 E350 Sedan
Could just be and probably is just one of those things. These cars are highly electronically sophisticated, and every now and then you will see a gremlin pop up for no apparent reason and then go away. You did exactly what I would have done-changed things up/started over and tried again.
I am not aware that the key needs to be turned one way or the other. In my E350, it does not matter.
Replacing the battery is never a bad idea. However, at least as I recall, that may only affect opening doors, etc-not necessarily startup.
I am not aware that the key needs to be turned one way or the other. In my E350, it does not matter.
Replacing the battery is never a bad idea. However, at least as I recall, that may only affect opening doors, etc-not necessarily startup.
Thread Starter
Junior Member
Joined: Nov 2018
Posts: 53
Likes: 0
2007 Mercedes Benz E550
Could just be and probably is just one of those things. These cars are highly electronically sophisticated, and every now and then you will see a gremlin pop up for no apparent reason and then go away. You did exactly what I would have done-changed things up/started over and tried again.
I am not aware that the key needs to be turned one way or the other. In my E350, it does not matter.
Replacing the battery is never a bad idea. However, at least as I recall, that may only affect opening doors, etc-not necessarily startup.
I am not aware that the key needs to be turned one way or the other. In my E350, it does not matter.
Replacing the battery is never a bad idea. However, at least as I recall, that may only affect opening doors, etc-not necessarily startup.
Thread Starter
Junior Member
Joined: Nov 2018
Posts: 53
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2007 Mercedes Benz E550
Thanks!
Member
Joined: Oct 2016
Posts: 128
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From: Torrance, Ca
E63 AMG
You can do both, you can even go as far as taking the key apart and cleaning the inside lens wipe a q tip and some rubbing alcohol. Mine was acting funky and was just dirty. But start with cleaning the key lens at the tip.
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Junior Member
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2007 Mercedes Benz E550
Sounds good! Sounds like a reasonable first step! Thanks!
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MBWorld Fanatic!
Joined: Feb 2014
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From: MA
2008 E350 4Matic, 2011 E350 4matic
The key actually doesn't use any battery power when it's in the ignition. The key could also be going bad so make sure you have the second key handy or switch to the other key. Otherwise it's an EIS problem. Search the old threads, a common problem. You might get lucky though and this is just a blip.
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Thread Starter
Junior Member
Joined: Nov 2018
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2007 Mercedes Benz E550
The key actually doesn't use any battery power when it's in the ignition. The key could also be going bad so make sure you have the second key handy or switch to the other key. Otherwise it's an EIS problem. Search the old threads, a common problem. You might get lucky though and this is just a blip.
Thanks!
Out Of Control!!
Joined: Jul 2003
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From: North Scottsdale, AZ
'71 Pinto
Thread Starter
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2007 Mercedes Benz E550
Just an update to this, this happened today again, and I noticed that I again used the key with the buttons facing the passenger door instead of the drivers door. Although it is designed to work both directions (which it did work the second time, with the key removed then reinserted but still facing the same direction), I think my specific key may have a scratch on the sensor or some other weirdness such that it just reads better when inserted with the buttons facing the drivers side. No big deal I'll just try to remember to insert it that way going forward as both times it has happened has been with the buttons in the same orientation.
