Scent from the vehicle

My friends vehicle 206 2001 model xt has been feeling a bitter smell similar to the smell from the engine part and bottom part of the vehicle for the last month. When the vehicle is cold, there is no smell, it increases more after the vehicle warms up, and when it is intense, it comes inside the vehicle and this smell disturbs a lot. I noticed a passing thing, this smell comes more intensely in rainy weather. Something that causes this odor comes to my mind whether the room catalyst might be broken or come from somewhere else. I am waiting for your comments. Thank you in advance.

Oil may drip into the exhaust.

I had the same model, I had the same problem, I had the same problem, get the battery out of the way, 90 percent of the battery is running out, as you said, the smell of a disgusting smell inside the car.

Well, my brother, where does the smell from the battery come from? The green light of the battery is still on.

You still have the battery checked, the only thing to smell is the battery.

If it leaks oil from the edge of the engine blog and touches the hot engine or exhaust, it also smells. First open the hood and check the left and right under the vehicle. Is there any oil. Replace your pollen filter and set it in place. If the filter is old or does not fit properly, the room takes in the smell

Lpg installation may be checked.

Friends, thank you very much for your suggestions.