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2008 Mercedes-Benz ML550 Questions

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Went out this morning to car making horn type squeal under the hood (car was off) door locks don't work, gauges don't work, no signal lights - started car and after running 10 minutes noise stopped - is there something that needs to be reset after replacing the dead battery
Replaced power steering pump and gasket twice already, and now dealer says it needs to be replaced again. Is it common for this to continue to occur? SUV has 150K miles.
When the car is cold steering is very normal. What type of cost and repair will this require. Has anyone else been through this?
I just bought a used 2008 ML 550 with 109,000 mi.
When I drive real slow, ( entering my garage) and try to turn the steering wheel, it takes so much effort that it is almost impossible to turn.
What is the problem?
Thanks much,
Doug
My rear light would not work even when the bulb was replaced. Dealer says assembly has a grounding problem which the dealer will fix [doing both sides] with a work around but wants around $275 to do so. Is this a design defect or manufacturing defect? Has anyone else experienced this problem? My sense is that MB should cover this cost. Also, the cost for simply replacing one front parking light is around $175 due to the need to remove the light assembly, so labor is the primary cost. I am shocked as to the foregoing expenses. Any comments?
says timing belt and sparkplugs need to be changed for $950
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