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Mercedes-Benz GL550 Questions

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No start, changed the battery, no click from.silonoid from the starter
not able to get to the nut of the bolt to remove the upper control arm.
my upper control arm bushing worn out. I want to replace them myself but cant get one of the bolt out as there seem to be no way of putting a wrench on the other end.
How could this have possibly caused a problem with TCU? Is it SW got corrupted or is it mechanical? Is it the TCU. that's what all the codes are pointing to.
I tried to wiggle it and still won't unlock.
It starts loud and then stops and is not so loud, also quietens when driving but starts when still. happens as soon as car is started. It is louder in the mornings. Crackling sound
Crackling noise coming from the engine area, it starts loud and then stops and is not so loud, also quietens when driving but starts when still. happens as soon as car is started. It is louder in the mornings.
Crackling noise coming from the engine area, it starts loud and then stops and is not so loud, also quietens when driving but starts when still. happens as soon as car is started. It is louder in the mornings.
Crackling noise coming from the engine area, it starts loud and then stops and is not so loud, also quietens when driving but starts when still. happens as soon as car is started. It is louder in the mornings.
My battery light came on while driving, and shortly after the radio shut off, lights flickered down. It then restarted. I pulled to the side, powered the car off and waited. I started it up again about 5 min later and no light, car drove home fine. Tis makes me very nervous. Oh yeah, btw, I just got it back from the dealership resolving a check engine light
The front driver side headlight is stuck to the side and not facing forward. Getting a error message of "active headlamps inoperable". I was wondering if there is a quick fix to this or you need to replace the entire headlight unit?
Iwe came back from out of town appro. 250 miles a the code came up that nite. Also with a milfuction code!
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