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FOGLIGHT bulb replacement

14259 Views 17 Replies 7 Participants Last post by  DeeLite
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It was time for me to get rid of the yellowish foglight bulbs and replace them with blue tinted ones that match the Xenons better.

Now there are two ways to access them, through the wheel well, which is the most common practice, but you can also go by taking out the front grill. To illustrate I thought I´d give that a try and let you guys see how it goes!



There are three screws in the mesh which you obviously remove and the whole plastic assembly comes off with the chrome ring around the foglight aswell.



Now there is enough room on the left to reach behind, take of the rubber that keeps the moist out of the foglight and get the bulb out.



reconnect the pins and start putting the bulb back into place. This is where I lost my patience because I just couldn´t get it straight in its place and secure it. In all my frustration and anger at this point I didn´t take any pictures anymore :Banane24:

Now that it is all behind me and I am calm, I can tell you what I did though:
I unscrewed the whole foglightmodule and turned it around so I could see it. Figured out the correct position of the bulb (pin up) and got it done.
After that it is doing all the steps backwards.

Now I knew how things were done I could do the other foglight without taking it completely out and within 2minutes time, piece of cake.

Just to show you the difference: left is standard bulb, right is blueish one.

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Did you not have this pdf to use as reference? (also available when using search function in this forum, applicable to fog lamps in R171 with AMG style fog lamp)

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@etyu Oh that's just great! Hahaha No, I didnt find these pdfs... Well, going through them, that is exactly what I ended up doing. I wanted to skip the step of taking the foglightunit out, but as it was the first time I did it, I got frustrated and had to do it anyway.
The second lamp I didnt take out because now I knew how it went.
Thanks for the guide. No use for mine now, this one looks more detailed.
Hello Jan, did you changed the bulbs for led?
Where did you by them, ebay offers a lot but not all of them works for our SLK.


Regards Alwin
Hey @Roopie072 I used bulbs you can buy in the carshop that have blue tinted glass. They are a lot whiter than regular bulbs. I tried many LEDs in the past and they didnt have enough light output. A few years have past now, so I don't know if they are better nowadays. I am thinking of putting a xenonkit in the fogs, thats insanely cool and white and bright!!


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Hey Jan,

The led nowdays are a lot better then a few years ago. I also discovered xenon for the fogs. I will do some research what's the benefit off xenon compering led. I just orderd a xenon kit for the headlights and led for the daylights. So the yellow fogs needs to be replaced..led or xenon. Maybe someone on this form has experience?
What kind of bulb is used in the front fog lamp? is it HB4?
What kind of bulb is used in the front fog lamp? is it HB4?
It depends... sorry I can't be more specific, but it can vary from model to model, and country to country. My UK-spec SLK 55 AMG front fog lights take H7 bulbs, but it would appear that some other countries have HB4s fitted (according to online manuals).

The safest thing to do is to check first. :tu:
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What kind of bulb is used in the front fog lamp? is it HB4?
From your profile: SLK55, then the fog lamps are H7's.
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Thank you guys I will take it out and check
Thank you guys I will take it out and check
Make sure you have spare plastic ties (the long ones, IIRC, 18 inches or more), see pdf as previously posted above.
A lot of screws out and H7 lamp easy to do it.. Now just need to find nice led H7 lamps
Thanks for the PDFs! I'll use 'em to replace the fog lamp assembly on my '09 SLK 55. :)
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Not paying attention and ran over a curb. Cracked the glass on the right fog light. Will be trying this over the weekend. It will be my first DIY event. Wish me luck.
Used the instructions in this post to change my fog lights. I was so excited to do this because I have never done any type of repairs on my cars in the past. The directions were spot on. Had anticipated only changing one light but after changing one the other looked terrible so I changed both. :grin::grin:
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