2011 S550 4matic Bi Xenon Bulb Change
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Joined: Sep 2022
Posts: 67
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2011 S550 4matic
2011 S550 4matic Bi Xenon Bulb Change
Wow, this was a pain but for whoever else runs into this. The Bi Xenon version does not have the 2 wire clips that squeeze together. I was going looney with a mirror trying to understand why I didn't see clips if WIS clearly states that 2 clips should be released. On mine it's simply a turn twist. Counter clockwise to remove. Bought my bulb from dealer but I saw Sylvania versions of this for about half. Be sure to reset Xenon service hours after changing bulbs. BTW, although it's tight, I only pulled the 1 screw for the expansion tank and lifted and held out of way. This is for right side. It's REALLY tight but with patience and some scratches on your hands, it's doable
Junior Member
Joined: Jan 2019
Posts: 39
Likes: 17
From: Los Angeles, Ca.
2007 S550 Facelift upgrade.
Wow, this was a pain but for whoever else runs into this. The Bi Xenon version does not have the 2 wire clips that squeeze together. I was going looney with a mirror trying to understand why I didn't see clips if WIS clearly states that 2 clips should be released. On mine it's simply a turn twist. Counter clockwise to remove. Bought my bulb from dealer but I saw Sylvania versions of this for about half. Be sure to reset Xenon service hours after changing bulbs. BTW, although it's tight, I only pulled the 1 screw for the expansion tank and lifted and held out of way. This is for right side. It's REALLY tight but with patience and some scratches on your hands, it's doable
I’ve done this before a couple times actually. I found it way easier to just take off each front wheel and the inner fender well plastic and the bulbs are right there. Just reach up, nno hand scratching, etc. I replaced all of my bulbs, with either the 100 watt halogen and the D1S bulbs that way. I get all my bulbs off of EBay (Phillips brand) and haven’t had a problem with quality or color. Never knew about the hrs reset….. how is that done?
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Joined: Oct 2021
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From: Iowa
2008 CL550, 2022 EQB 300, 2023 EQS 450 4Matic
I’ve done this before a couple times actually. I found it way easier to just take off each front wheel and the inner fender well plastic and the bulbs are right there. Just reach up, nno hand scratching, etc. I replaced all of my bulbs, with either the 100 watt halogen and the D1S bulbs that way. I get all my bulbs off of EBay (Phillips brand) and haven’t had a problem with quality or color. Never knew about the hrs reset….. how is that done?
Junior Member
Joined: Jan 2019
Posts: 39
Likes: 17
From: Los Angeles, Ca.
2007 S550 Facelift upgrade.
I apologize, I should have been clearer in my response….. I have changed the low beam, high beam and the bulbs that turn when the car wheels turn and the fog light bulbs, by taking off the front tires and inner fender flaps. I have after market parking lamps that are LED, I replaced the whole parking lamp housing via reaching in from the tire well area. I have an 07 S550 and have not had to replace turn signals, yet. Knock on wood!
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Joined: Apr 2022
Posts: 145
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From: Tewksbury, MA
2008 S550
A couple weeks back I had no problem replacing the passenger side bi-xenon on my 2008 S550 by unbolting the expansion tank and setting it aside. Bulb had the two clips. Total time was like 10 minutes max. No way the fender well route takes under 10 minutes.
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Junior Member
Joined: Jan 2019
Posts: 39
Likes: 17
From: Los Angeles, Ca.
2007 S550 Facelift upgrade.
You are right. The tire/fender well route does take longer, but I think it’s easier to get to fog lights, cornering light and headlights a lot easier. I also have a lift in my garage, so that makes a world of difference too.
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Thread Starter
Junior Member
Joined: Sep 2022
Posts: 67
Likes: 31
2011 S550 4matic
Yours has the two clips, I went looney because even WIS shows that bulbs are held in with 2 clips. That seems to be for early models , 2011's are twist in. Yes I agree that it's simpler from above but it sure is tight for such an expensive bulb, bought from dealer, 250 after tax and that's below list. Didn't want the possibility of an aftermarket bulb looking different
Junior Member
Joined: Jan 2019
Posts: 39
Likes: 17
From: Los Angeles, Ca.
2007 S550 Facelift upgrade.
Yours has the two clips, I went looney because even WIS shows that bulbs are held in with 2 clips. That seems to be for early models , 2011's are twist in. Yes I agree that it's simpler from above but it sure is tight for such an expensive bulb, bought from dealer, 250 after tax and that's below list. Didn't want the possibility of an aftermarket bulb looking different
