SEV1 is the normal service reminder. Nothing to worry about. 41e is START SIGNAL MISSING. This most likely a problem with wire 107 of the engine harness. 45e is a problem with the engine speed sensors. Replace the one on the front timing cover first. If that doesn't fix it then it's likely the sensor in the injection pump on the main shaft. You have to send the pump to repair shop for this. Usually what happens is the main shaft bearings get loose and the tone wheel rubs on the sensor and buggers it up. Simple problem, expensive fix.