Crank, no start

Car was taking a while to start (at least 10 seconds when cold, maybe 4 seconds when warm).

threw a code for the camshaft position sensor, so installed a new one. Now the car won't start at all. I tried swapping the old one back in, but it still cranks and won't start.

Funny thing is the code went away for the camshaft sensor, and two transmission related codes came up, a p0700, and another p07 something (can't remember) even though the car only cranked and did not turn over.

Could a crankshaft position sensor be the culprit, even though that code did not appear?

Thanks in advance.