How long do the crank position sensors usually last on these cars? Any signs it may be failing?
(not a current issue but to stay ahead of all the parts)

 

They seldom give any issues unless there’s a lot of corrosion under the car. In that scenario I've seen the sensor corrode in place and they have to be destroyed in order to replace one. For example, if you’re trying to pin the flex plate to put the engine in time, the crank sensor has to be removed.

 

could you expand on what you mean by “pin the flex plate?”
i might know what you mean but to be sure

 

To lock it with a tool when doing timing work.

Replace it when there is an issue or code. It's an easy and quick replacement so no real point in preventative maintenance here.

 

thank you i will bare that in mind for future reference 👍👌