C Class (W205) C 180 BlueTec,C 200 BlueTec,C 220 BlueTec,C 220 BlueTec BlueEfficiency,C 250 BlueTec,C 300 BlueTec Hybridplus,C 180,C 180 BlueEfficiency,C 200,C 250,C 300,C 400 Plug-in Hybrid,C 400

KEY NOT DETECTED

Old Jun 24, 2021 | 03:52 PM
  #1  
mazenkanso's Avatar
Thread Starter
Newbie
 
Joined: Jun 2021
Posts: 3
Likes: 1
c300
KEY NOT DETECTED

Hello, I installed LED lights in the center console and now I " sometimes" get key not detected !! I need to hold the key behind the seat to push the start button and once the car starts everything is fine unless I stop and open the door. The LED does not necessarilt have to be on when I get the key not detected. Any help would be appreciated.
Reply
Old Jun 24, 2021 | 04:14 PM
  #2  
Cosworth2000's Avatar
MBWorld Fanatic!
10 Year Member
Community Builder
Liked
Community Favorite
 
Joined: Jun 2012
Posts: 1,229
Likes: 188
From: Toronto
2022 E53 AMG
Change the battery on the key and see if it still happens.
Reply
Old Jun 24, 2021 | 06:23 PM
  #3  
stockbmw's Avatar
Super Member
 
Joined: Dec 2016
Posts: 797
Likes: 141
2018 C43
See if the problem exists using the 2nd key. If so, you might have crosswired the LED with the proximity sensor wire.

​​​​​
Reply
Old Jun 24, 2021 | 06:26 PM
  #4  
Elvisfan0108's Avatar
MBWorld Fanatic!
5 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2018
Posts: 1,432
Likes: 300
From: Illinois
2021 c300 Cab. Arrived 7/28/21 . 24 GLE 450e.
Originally Posted by mazenkanso
Hello, I installed LED lights in the center console and now I " sometimes" get key not detected !! I need to hold the key behind the seat to push the start button and once the car starts everything is fine unless I stop and open the door. The LED does not necessarilt have to be on when I get the key not detected. Any help would be appreciated.
Sounds like interference to me. LEDS can create interference.
Reply
Old Jun 24, 2021 | 06:31 PM
  #5  
Andy74's Avatar
MBWorld Fanatic!
5 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2018
Posts: 1,246
Likes: 243
W205 2015
The key sensor is in the central console bellow the right cup holder. You could have mooved it while installing your LED. First install a new battery in your key see if it works. If not you will need to remove your console again and check the key sensor.
Reply
Old Jun 25, 2021 | 01:03 PM
  #6  
mazenkanso's Avatar
Thread Starter
Newbie
 
Joined: Jun 2021
Posts: 3
Likes: 1
c300
Thanks, I did change the battery and used the extra key, still same issue
Reply
Old Jun 25, 2021 | 01:22 PM
  #7  
Elvisfan0108's Avatar
MBWorld Fanatic!
5 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2018
Posts: 1,432
Likes: 300
From: Illinois
2021 c300 Cab. Arrived 7/28/21 . 24 GLE 450e.
Originally Posted by mazenkanso
Thanks, I did change the battery and used the extra key, still same issue
Again, interference. Even my garage door opener says range may be reduced by using LED bulbs.
Reply
Old Jun 25, 2021 | 04:20 PM
  #8  
Andy74's Avatar
MBWorld Fanatic!
5 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2018
Posts: 1,246
Likes: 243
W205 2015
Originally Posted by mazenkanso
Thanks, I did change the battery and used the extra key, still same issue
Check the key sensor in the centre console. I had the same issue when i installed my 10.25" screen.
Reply
MB World Stories

The Best of Mercedes & AMG

story-0

New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

 Verdad Gallardo
story-1

6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

 Verdad Gallardo
story-2

Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

 Verdad Gallardo
story-3

Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

 Verdad Gallardo
story-4

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
story-5

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

 Verdad Gallardo
story-6

Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

 Verdad Gallardo
story-7

Mercedes EQS Gets A Major Update: Everything You Need to Know

 Verdad Gallardo
story-8

5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

 Verdad Gallardo
story-9

Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

 Verdad Gallardo
Old Mar 23, 2024 | 04:29 PM
  #9  
Shibin's Avatar
Newbie
 
Joined: Mar 2024
Posts: 1
Likes: 0
W205
Same issue for mine also

Have you got the solution.
And where exactly is the sensor located ?
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 08:04 AM.

story-0
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

Slideshow: Mercedes-AMG's new electric GT 4-Door Coupe trades combustion for software, synthetic noise, and more than 1,100 horsepower.

By Verdad Gallardo | 2026-05-20 20:08:15


VIEW MORE
story-1
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-2
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-3
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-4
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-5
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-6
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-7
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-8
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-9
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE