I have a 93 integra gsr swap and when i let my car sit at idle when it is already warmed up it starts to raise in temperature. I don't have a CEL but i checked anyways and I am throwing a code 6(Engine coolant temperature sensor) code 41 (Oxygen Sensor Heater). Should i change these things even though the check engine light doesnt come on? IS it possible that its still faulty?

 

change them..why not, they have been "thrown" for a reason.
about ur car overheating at idle, check to see if ur radiator fans are turning on. if ur car doesnt overheat while driving, its because ram air cools it down and not the fan. that could be a small possiblity. some guys on here may steer u towards water pump failure. check easy things first .g/l