Today’s cars have an onboard computer diagnostics (OBD) system that continually analyses the status of the vehicle’s components.
Engine testing can reveal problems within a car’s engine, and other major components.
As well as performance issues with the fuel injector, air flow and coolant, ignition coils, and throttle.
However, a common misconception about car engine testing is that technicians can use code-reading tools to determine the exact problem that triggered the check engine light.
In reality, the code tells technicians which engine or component parameters are out of range, but it does not detail the cause of the problems. Finally, That’s where the good old human brain comes in handy, as the technician uses experience and expertise to diagnose the underlying problem.
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When started, your engine should run smooth, without shaking or hesitation.