Charging voltage is on the low side of good but nowhere near causing a problem. The voltage would pickup after the battery if fully charged and might hit 14.7

Most torx bolts that need a " M " female socket can be removed with regular 6 point sockets, the fit is very good.

Don't randomly throw parts at this car, see what the codes say. Now, I do however change parts when they get towards the end of their expected life. The crank sensor is one of these items I change at your time and mileage.