Maybe your water thermostat is stuck open. It would cause the entire car to run cool. Might not register a code or you won't find the code if you aren't looking for it.
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here!
| Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors