Typically, your air filters should be changed every 10, 000 to 15, 000 miles.  Environmental conditions will impact this timing.  For example, if you live in a heavily polluted area or if you drive on dirt/gravel roads more often, your air filters will probably have to be changed more frequently.  

You get up in the morning and get ready for work.  You are going to make it on time.  You get your car, you put your key in the ignition and turn the key.  It won’t start.  Dang it.

Just because your “check engine” light is on, it does not mean you have an immediate or costly issue with your vehicle.  Unfortunately, there are a number of issues that are signaled by the “check engine” light.  The good part about this is that they are not costly.