No California doesn't require a yearly auto inspection. But it does require that if a vehicle is sold and bought, it should be brought into the DMV for a smog-check.
Currently, 18 states require auto inspection on an annual, or bi-annual basis. However, several states have "inspections" that are simply detailed emissions tests, designed to reduce the level of air...
It depends on where you go and how much you pay. most mechanics check all the fluids and filters on your car anytime you bring it in because they want to sell you some more parts so he can make more...
Auto inspections can range from very low to very high. It depends on what type of inspection you are looking for and what quality you want and how much you are willing to pay for it.