Some Nissan Pathfinder 2002 owners report experiencing issues such as black smoke from the exhaust, sluggish performance, and recurring plug sensor malfunctions. The presence of black smoke can indicate a serious engine problem, often linked to an imbalance in the air/fuel mixture due to fuel delivery or combustion efficiency issues. Additionally, sluggish performance may suggest underlying problems affecting the engine's operation, such as incorrect air/fuel mixture or sensor malfunctions. Owners also report recurring plug sensor malfunctions, which may stem from faulty camshaft or crankshaft position sensors, potentially leading to drivability issues without triggering fault codes. It is recommended that affected owners have their vehicles inspected by a qualified mechanic to diagnose and address these critical issues, including checking the MAF sensor, distributor problems, fuel delivery issues, and ensuring spark plugs are functioning properly.

Rattling and tapping in the front of the engine on the Nissan Pathfinder is very evident, especially on cold starts. This rattling noise should not be taken lightly as it warns of upcoming timing chain failure. The cause of the noise is faulty timing chain guide rails and timing chain tensioners that wear out well ahead of schedule. These components are there to keep the timing chain tight and properly positioned. When these parts fail, the timing chain becomes loose, and pieces of the timing chain guides break off, falling into the oil pan. To remedy the situation, Nissan/Infiniti has made revised guides and tensioners, but replacement can be very costly. Proper oil change intervals and oil type may help slow or prevent the situation.