What does ars mean i have a merceds benz sel 500

at rear of engine ,flywheel 5mm allen key or 10mm socket

If it has 4 gears, the shift indicator will show an overdrive gear, maybe a D with a circle around it.

Check ASR system. Wheel sensors would be a good start because thats what the system checks for speed difference at the wheels. It reduces power to keep you straight on the road.

Not familiar with your Merc. This is general info. My porsche has a mecanical belt tensioner down low under the engine off the ground. Toyota has a spring charged piston pushing a belt tensioner wheel. Most other cars I've worked on had a pivoting alternator. If your car has a flat serpentive belt then it probaly has a spring loaded tensioner. If it has Vee belts then something sets the tension mechanically at install. Good luck!

it's the brake switch, behind the brake pedale located, to replace.

In the driver's side trunk along the wheel well and behind the wheel well cover you will find the sunroof motor. There is a plastic knob that can be turned to close/open the roof manually. The socket tool is part of the original toolkit that came with the car, but otherwise, you can locate one that will fit. Don't use pliers as the plastic easily breaks. Meanwhile, have you looked at the fuse or toggled the switch hard to work? If the motor works, but doesn't move there is an adjutment on the motor's clutch that can be tightened. Hope this helps.

definatley transmission

check fuse. It is outside of fuse box in a black plastic strip fuse holder by the brake booster.

Probably a modulator, however check that the "bowden" cable is properly adjusted (this is the cable that does the "kickdown" and also goes to a vacum /valve.It is simple to adjust, basically with the engine turned OFF, check that the 2 pointers (like arrows) align, (one is on the cable). Being a merc it pays to have the tranny properly serviced, and its filter changed at least every 2 years though merc says 60,000k's. And the one thing that will kill a merc transmission is the WRONG oil, it has to be according to the spec sheet which is in your user manual.(lots of tranny shops use anything!)
Also check the dipstick for discolouration/and or burnt smell.

hi friend,

go to
www.Books4Cars.com
or
www.DataManuals.net
or
www.autosmanual.com/.../mercedes-benz-operator’s-manual-ml-320-se-420-sel-500-sel-pdf.html -

thank u for using fixya

regards,
sivaranjini