By Ada Hagan
Imagine this. The check engine light comes on in your car.
You drive it to an auto parts store to get the check engine code read free of charge and an employee gives you their best guess for the needed repair. Feeling you have the solution, you drive to your local repair shop (that would have charged $100 to read the code!) and request the repair.
Proud of your resourcefulness, you pay, pick up your car and leave with a swagger to your step.
Until 3,000 miles later when the check engine light comes on. Again.