The scent in the car is probably not very bad, but in no case should it mask any smell. The car should ideally smell like leather, in the worst case - plastic (but not burnt). The average car inside should not smell anything at all. And if it smells? So something is most likely going wrong. Let's sniff the car and see what smells should alert us.
The most common car smell is gasoline. Let's not talk about carburetor cars now: they are almost gone, and the reasons for the gasoline stench they have a little original. Therefore, only injector, only mainstream.
In principle, there are many sources of gasoline odor, but some of them rarely manifest themselves. Let's start with the most popular ones, then we'll get to the exotic.
So, most often, the inside of a car stinks of gasoline because of the gas pump, which, as a rule, stands under the back sofa. The immediate cause is a rubber ring, a gasket through which the fuel pump is pressed against the gas tank through a hatch in the body under the seat. Over time, this gum, like any other, dubs and begins to let gasoline vapors through. The solution is simple - replacing the gasket. And the good news is that in this case, the smell is certainly annoying, but not too much of a danger. It is worse if gasoline flows in the engine compartment.
The second common reason is a problem with the filler neck. In theory, this is a separate part, although it can be tightly welded to the tank. But tightly is not always for centuries. The seam can also leak. And the clamp of the plastic neck - even more so. True, there is one "but": there will be nothing to flow in the literal sense of the word - the level of gasoline is much lower. Perhaps when refueling at a gas station, but this is also inaccurate. But the smelly vapors of gasoline go there with a bang. And the saddest thing is the inaccessibility during examination.
A less common reason is also related to the gas tank. Sadly, the iron tank also rusts, and sometimes holes appear in it. And he can also rub against another piece of metal or broken-down fasteners. This damage is usually easier to find: the tank starts leaking.
By the way, if you wish, you can put a plastic gas tank off-road. It will stink too, but not for long: as a rule, gasoline will flow out quickly, and there will be nothing to stink. So this is just food for thought.
Gas tank reasons are most likely. Just in case, I will name two more: this is a clogged absorber and an inoperative gas tank cap. In the first case, the absorber (this is the kind of thing that collects gasoline vapors and returns them to the tank) does not cope with its work (for example, the filter is clogged), in the second - the lid in the old car, which begins to let gasoline vapors through. The reasons are not the most obvious, but possible.
If gasoline does not smell from the gas tank, there is a reason to be even more upset. Because leaking fuel under the hood is not only unpleasant for the nose, but also life-threatening. In a carburetor car, gasoline could flow through all the connections and fittings of the fuel pump and fuel filter - all this was right next to the engine. In the injection room, all these things are also there, but they are hidden away. And they flow less often. But there are small parts that can cause bad odor - the fuel injector O-rings. There will be no puddle of gasoline around them, but the smell is quite possible.