Thinking its the crank sensor
 

I have a Volvo 850 it has no gas or spark I removed the battery for 15 minutes and it started up. It ran fine to my parents house but after setting over night it would not start again, after disconnecting the battery a series of times it started and I drove it to my garage. I am pretty sure it is the crank sensor. I am in dire need of information on how to replace it. Any help would be greatly appreciated.

eboknight

Check the cam sensor and see if the plug is falling apart.