M-Class (W166) Produced 2012-2015

ml550 driver side headlight and break light issues

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Old 03-13-2019, 10:27 AM
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Mercedes ML550
ml550 driver side headlight and break light issues

Hello - for clarity on a scale of 1-10, I'm about a level 3 mechanic so please excuse my terminology.
I have a 2008 ml550. The left front low beam headlight does not work; I've changed the bulb and headlight assembly and still doesn't work. However the high beam does work so I know it's getting power. Occasionally it will work randomly as I'm driving and then go off. The same is with the left rear break light. I've replaced the bulb and it will work for a week or so and then stop working. Any help is appreciated.

Last edited by MikeMazz; 03-17-2019 at 09:11 AM.
Old 03-13-2019, 12:21 PM
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Originally Posted by MikeMazz
Hello - for clarity on a scale of 1-10, I'm about a level 3 mechanic so please excuse my terminology.
I have a 2010 ml550. The left front low beam headlight does not work; I've changed the bulb and headlight assembly and still doesn't work. However the high beam does work so I know it's getting power. Occasionally it will work randomly as I'm driving and then go off. The same is with the left rear break light. I've replaced the bulb and it will work for a week or so and then stop working. Any help is appreciated.
your question is better addressed for the W164 section rather than this, since this is for 2012-2015 models
Old 03-17-2019, 09:10 AM
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Originally Posted by drwolf
your question is better addressed for the W164 section rather than this, since this is for 2012-2015 models
Thank you!

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