Engine Diagnostics Tips
Schedule a complete check-up and Engine Diagnostics (Manufacturer's Recommended Maintenance Schedule) check at 15, 30, 60, and 90,000 miles, then every 30,000.
The diagnostics of a car's engine are very complicated. Most cars have a Check Engine light that turns on, but this light does not indicate exactly what the problem is. The best way to find out is to have your mechanic run an engine diagnostics test on your vehicle.
Sometimes just reading the code (that the check engine light indicates has been stored) will provide the answer to the problem. But often it will only direct you to which general system is not within specs. This is where a professionally trained auto technician can save you time and money by diagnosing the problem correctly the first time.
If you are a do-it-yourselfer, you can get many diagnostic supplies at your local parts retailer as well. But keep in mind their primary job is to sell you parts and not accurately diagnosing the problem.