Mercedes-Benz R500 Questions

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I want to do a simole tune up but i need to know how many spark plugs to buy
Fluid under my car. is this a DIY fix? I think has the 7 speed automatic. 722.9 ?
light will stay on all night. my right headlight only.
Engine runs shifts into gear but very hard to steer or turn.i have to usevalot of strentgh to steer it in any direction
Is the compressor burned up or just the pulley bearings
po0600 is fail communication between modules could aftermarket part csp sensor be problem or what

car had multiple codes, and issue w/ suspension, and a steering angle sensor issue, got all those cleared up, now cant get rid of these lean codes.
problem sounded as if the battery was not charged fully. replaced with new battery, it still does it, but with the new battery it will start usually after removing key and trying again.
dealer says he went through the oil pan to replace the valve body and has notice that a bolt that holds the valve body in place is broken and he has to charge 1700 to replace the bolt
my trunk is not closing. it not catching the peice to close. it stays open. how do i fix it
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