These concerns may be a check engine light, poor fuel economy, lack of power or, more importantly, your Tim Horton's window won't go down in the drive thru. These concerns cost you money for extra fuel when your engine isn't running the way it was engineered to, and when your Tim Horton's window won't go down your pride suffers. So, if your check engine light is on, you are consuming more fuel than you should be, your vehicle doesn't have as much power as it used to, or maybe your Tim Horton's window isn't working, your vehicle needs diagnostics performed.
