What could be the cause for smelling exhaust inside a 98 QX4 infinity?

Smelling exhaust inside a 1998 Infiniti QX4 could be due to several issues, including a leaking exhaust system, such as a damaged exhaust manifold, muffler, or exhaust pipe, which allows fumes to enter the cabin. Another possibility is a faulty or improperly sealed cabin air intake, which could draw in exhaust fumes from outside. Additionally, issues with the engine's combustion process, like a rich fuel mixture, could also contribute to exhaust odors. It's important to address this issue promptly, as inhaling exhaust fumes can be hazardous.