Just bought a 2009 i30CW petrol 2.0 and having intermittent issue with exhaust smell in the cabin while driving. I've tried turning off the HVAC system entirely, closing the vents, putting it on recirc only. Problem persists.. just been driving around with the windows down and copping it. bought a carbon monoxide detector on ebay so I'll be keen to measure it once that arrives.
Bought it dealer used so I took it back. Mechanic walked me through the exhaust system and insisted it's holding pressure, though I'm not sure how thorough he was. He checked/cleaned out the cabin air filter and checked the seal on the rear hatch.
fuel economy has been very mediocre too. averaging 12.5l/100 city driving. maybe not related but noteworthy.
Anyone else had this problem? My theory is that there's a small leak in the exhaust system and the engine bay is filling with exhaust fumes which makes its way into the cabin but I'd love some guidance.