Mechanic Q: what is a cabin filter??

What is a cabin filter & how do I replace it? This seems like an additional cost for something I dont really need.

Mechanic Q: Engine Light comes on?

My check engine light keeps coming on & off. I had it checked & it said it's an oxygen sensor. Should this concern me? Can I just wait until it is time to get my car smogged? (I live in CA)

Mechanic Q: Tire Pressure Light?

Do I need to replace my tire pressure valve stem with one with a sensor or can I save money & replace it with a standard censor.

Mechanic Q: What is wrong with my car?

My car has a problem