I just replaced the CPS on my 2000 ML320 last night, not a hard job, just a tricky one. The CPS is located just above the bell housing on the rear of the engine on the drivers side (down between the engine and the fire wall). You should be able to see it with a light if you look down over and past the brake master cylinder. There will be a wire lead connected to it. The only way to get to it on my ML was to lean atop the engine and work my way to the opening (not really that hard). The bolt is a six point star, if you don't have thetool to remove it just use a six point 1/4 inch socket, it will work just fine. I also used a 1/4 inch drive - smaller and more maneuverable in the confined space. I'd also suggest using a magnet to secure the bolt, it is worth the extra assistance. The job should take you about 40 minutes from start to finish. Good luck!
F.E.
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