What causes the exhaust to smell like ammonia in my 2006 Hyundai Tucson?

A smell of ammonia in the exhaust of your 2006 Hyundai Tucson may indicate incomplete combustion of fuel or an issue with the catalytic converter. It can also suggest that the engine is burning oil or that there is a problem with the fuel system, such as a malfunctioning fuel injector. Additionally, coolant leaks into the combustion chamber can produce a similar odor. It's advisable to have your vehicle inspected by a mechanic to diagnose and resolve the issue properly.