Well you first need to get the exact code.
Also, are there any symptoms of a problem or is just the CEL(check engine light) on?
It won't be Crank position(CKP) sensor or engine would not start, CKP sensor is about the only sensor that can cause a no start/no run.
You can buy a Bluetooth OBDII device that plugs into ANY car or truck made after 1994, for under $40, so less than the price of a sensor in most cases.
You can read codes or live data on your smartphone via Bluetooth.
You can watch data live from any sensor while driving, very handy device, and as said works on ANY car or truck from 1995 and up so not just a Ford or Ranger tool
Last edited by RonD; 08-25-2015 at 08:51 PM.