Because of the rate of expansion between cylinder heads metal and valve covers are different every car will need valve cover gaskets replaced at least once in it’s lifetime. The seal/gasket will break down over time and your engine will leak oil from here. Valve cover gaskets are typically made of a cork/paper composite or
On most vehicles the cabin air filter is behind your glove box and are usually pretty easy to reach. After removing contents of glove box, unhook the little arm that supports the glove box when it is open, usually this is on the right side of the glove box. Behind the glove box you may see a face plate
You should change your engine air filter every 15k-30k miles depending on your driving conditions. More often if you commonly drive in dusty areas or dirt roads. If you do not drive a lot of miles then it should be changed every 3 years, they become brittle with age and can start to come apart.
There can be several reasons that a tire pressure light can come on. The most obvious would be that it is low on air, this could be because it has a leak or just from outside temperature change. If your car calls for say 32 psi in the tires, with a sharp drop in temperature