Eclipse p0335 and p0340 codes help!
 

Hey all I'm new on this so forgive me if I'm in the wrong thread but I'm having some issues with my 02 eclipse gs. It has an 01 2.4L engine in it with 111k miles on it and I have a spare motor (01 2.4L) with 66k on it. Anyways, my car is throwing two codes, the p0335 (Crank sensor) and p0340 (Cam sensor). My car has been running absolutely fine when I had the original sensors in it and I switched the sensors over from the engine and it still runs fine but still has the codes being thrown. I have heard about the possibilty of bad ignition coils and bad grounds but I'm looking for other help too if anyone else has had this problem, also my temp gauge light is a bit dim (don't know if that has anything to do with it). Any help would be much appreciated, Thanks.

Any replies could help, please this problem is a bitch for me to figure out lol.