Quit screwing around with aftermarket sensors - BIG MISTAKE when it comes to the CPS. Order this:
https://www.germanautosupply.com/mer...ensor-227.html

I doubt the cable harness is bad, I really do. And stop going to Chyrsler for parts, dont' even search "Crossfire" search "2003 SLK320" for such items.
Sure, you cant order a DOOR or BUMPER that way, but almost anything engine/drive train/chassis you can. Price will be way lower than the "CHrysler" part, and it will be easier to find.