Your air filter stops dirt and dust particles entering the engine. Just like your vacuum cleaner, it needs to be kept clean to work properly.
Fresh air is vital for your car's engine to perform well. If the air filter is not replaced when needed it could lead to a drop in performance as the engine tries to 'breathe' through a dirty filter. This could in turn cause your car to be difficult to start.
During a major service, the old filter is removed, the housing and hoses are checked and cleaned and a new filter fitted.
Benefits of having the air filter changed are an optimised engine performance and fuel economy and it also maintains the mechanical integrity of the engine