S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

keyless door locks

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Old Apr 6, 2024 | 08:51 AM
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EURO-JIM-121's Avatar
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From: michigan
S550
keyless door locks

2008 S550 4 matic: My driver door does not respond to my touch for unlock or lock. It worked well since I bought the car last year but recently became sporadic and now, not at all. All the other door locks work. I thought it might be the FDOB battery, but changing it had no affect. Is this a "take-apart-the-whole-door" ordeal to replace a sensor? Or is there a simple fix?
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Old Apr 6, 2024 | 09:53 AM
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2012 S350 Bluetec, 2014 GLK250 Bluetec, 2026 E350 4Matic
Originally Posted by EURO-JIM-121
2008 S550 4 matic: My driver door does not respond to my touch for unlock or lock. It worked well since I bought the car last year but recently became sporadic and now, not at all. All the other door locks work. I thought it might be the FDOB battery, but changing it had no affect. Is this a "take-apart-the-whole-door" ordeal to replace a sensor? Or is there a simple fix?
most likely, the door handle itself has gone bad. I am facing the same issue on mine and looking into how to replace it. You should be able to pull codes from the cars computer to determine if that is the actual issue. Mine has a code that states that the door handle is bad.
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Old Apr 7, 2024 | 12:45 PM
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It's almost certainly the door handle, a VERY common issue on keyless go Mercedes from this era. The job is super easy and should only take maybe 1-1.5 hrs if it's your first time.

Go online and find a door handle for your car that's the same paint color (unless you like a beater look lol)

How to:
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Old Apr 8, 2024 | 09:30 PM
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2011 E63 AMG, 2007 S550 AMG
I had the same problem with my ‘07 S550. I ended up swapping the driver side front and rear door handles since I wasn’t able to find a door handle easily. The swap was easy and took about 30 minutes total.

Good luck!
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