Okay, so it's been a seriously long frickin' time since I've had/owned/wrenched on a Honda, but I'm looking at getting another one. I need a little on road fun in my life and I found a 1991 Civic hatch with a b18 swap for about $2000. There are a couple of little problems with the car and I need some help to see if it's worth me getting/fixing this car. The first is that the car is over heating because the fan switch is busted, not installed, whatever. I got that. The second is that, because the car was overheating this douchbag kid, who's mommy bought him the car, over heated it and blew the head gasket. The head gasket has been fixed, but there is still an error code saying that the "cam position sensor" is off. The car is running a little rich when cold, is this being caused by this sensor? If it is, how serious of a repair is it?