Have you noticed your cars performance getting a little sluggish lately? Maybe you need to replace your Jaguar air filter. There are many parts of your engine that can be affected by a dirty air filter. For starters, you can say goodbye to good gas mileage if your air filter is dirty. Another area that suffers without a clean air filter is your emissions control system. Even your spark plugs can be affected when you wait too long to change your air filter. A general rule of thumb to follow is to change your air filter one per year. By doing this, your engine's performance will never falter due to a dirty air filter. All the air that travels through your engine is first sent through the air filter. Once your air filter is dirty, it isn't as efficient at catching dirt and debris as it used to be. Once these kinds of particles escape into your engine, it could get damaged.