I thought it smelt more like petrol, but I don't have a strong sense of smell and exhaust fumes is a possibility. The smell is very strong at times, but at other times I can't smell it at all.
I've taken the engine cover off and can't see any signs of leaks. However, there is a yellow plastic T-shaped junction next to the alternator where three black pipes meet. The pipes themselves look OK but the plastic union is oily and brittle and the pipes slide on and off very easily, suggesting there may be a little leakage there. Would that account for smells getting into the cabin?
One other possibility: I know the middle section of the exhaust is ready for replacing, and may be leaking fumes underneath the car. Would they be able to penetrate inside when the windows are shut?
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