Short notes on my recent experience:

Original Crank Position Sensor recently caused a no-start situation. Wiggling wires (and praying) got the car to start and run long enough to drive home, but after parking, no amount of wire wiggling could re-start the car. (Part is all but unobtainable from local stores; keep one on hand.)

A lot of the advice online about replacing the sensor pertains to the 700/900 series. This is what it might be like on a 240.

Replacement of the sensor took about 45 minutes total. I used a 3/8 drive ratchet, about 20" of extensions, and a 10mm wobble-socket. The 3/8 drive worked, but 1/4 would have been easier.

I have medium/large hands and I was just able to squeeze one into the space allowed. I was able to use my fingers to carefully retrieve the loosened screw, to position the sensor, and to guide the socket (required).

The sensor, despite having VERY bad insulation, came out very easily. If you can manage to have your rear mail seal leak just a bit, it may lubricate the area for you, making things easier. Well, it worked for me.

Close your eyes and visualize the sensor when putting it back - it will be the only way to get the screw hole lined back up.

Silicone rescue tape works very well around the joint of a wobble socket to make it sort of return to center automatically (this helps) and also works to sort of hang over the end of the socket and keep the screw from falling out. Once the screw has started threading in the hole, you can pull the socket away, no problem.

Hope this helps somebody know what they're getting into. It was certainly no "10 minute job" like I've seen others claim, but also not a nightmare. Slow and steady wins the race. Good luck.

Sean