The crankshaft position sensor can fail causing the engine to run poorly or it may crank but fail to start.
2003 Nissan Maxima Problem Reports
RepairPal Verified 2003 Nissan Maxima Problem Reports
The ground inside mass air flow (MAF) sensor can corrode and possibly cause drivability problems. The corrosion is enough to affect the sensor data but not enough to create a trouble code. Diagnosing this can be difficult because it won't always illuminate the Check Engine Light.
The thermostat may become stuck closed, causing an overheating condition. Replacement of the thermostat will be required to correct this concern.
Problems with the ignition coil will cause the vehicle to misfire or not start.
The engine mount on the right side can wear prematurely and cause excessive engine movement.
The external seal on the engine oil cooler can fail and create an oil leak.