Can almost guarantee the valve cover gasket on that side is leaking slightly. Oil drips down on the exhaust manifold and the catalytic converter, burns and it is sucked into the fresh air intake at the base of the windshield. It will also tail up around the hood.
The repair is not terribly difficult though the passenger side is harder due to the heater hoses. And it's likely the driver's side gasket will go soon too so best to have both gaskets replaced.
Like I said, not a hard repair but a dealership quoted me $220 to replace the passenger side gasket on my '03 - made it easy to decide to do the repair on both sides myself.
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2003 Renegade, Black
- 3.7L, 42RLE, 4.10's, ARB Bull Bar, Smittybilt XRC 9500lb Winch, 4X Guard Trans skid, Skid Row Engine skid, Factory T-case & Tank skids, Custom BoulderBars, JBA Front Coilovers, OME 948 rear springs, Bilstein rear shocks, JBA A-Arms, Moabs with Goodyear Duratracs 265/70-16