My ecu light is on I'm pretty sure it's due to the CTS being broken maybe, or just the wires a little fubarred, as the temp gauge is flickering up & down. Now, if this stays like this will it be ok to continue driving as I'm guessing all that will happen is the ecu will think the coolant is cold & pump more fuel in to compensate, or will it have other more serious effects? Any idea's? Of course a replacement is needed, but I'm out of time doing that before I go away in the car! Ant.