FLAPS commonly refers to intake air control flaps, including systems such as swirl flaps.
These systems are particularly common on modern diesel engines.
The position of the intake flaps can be changed depending on engine speed and operating conditions
to influence airflow characteristics.
A mechanical flap problem, however, is still a mechanical problem.
Software cannot physically repair a broken actuator, damaged linkage or heavily damaged intake
component.
This distinction is important when diagnosing a vehicle.