New cars have more than 100 different electronic ecu to monitor and control various functions during normal
vehicle operation. These ECU control items like braking, fuel delivery, ignition timing, transmission shift points and many other functions. Computers also give cars the ability to diagnose problems. When a car's on-board computer detects a problem, it will record a trouble code that indicates which system is not performing to specifications. Some trouble codes can even tell you if one of the car's sensors is malfunctioning.
Figuring out how to fix the problem .the first step is to know what your car is trying to tell you. The language it speaks is OBD2, which stands for On Board Diagnostics. If something goes wrong, a technician (or you if you have a diagnostic tool ,such as launch creader v ) can plug into your car, and will get some trouble code telling them what is wrong
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