Which of the following is NOT typically part of injector maintenance?

Cleaning air filters is not typically part of injector maintenance because air filters are generally related to the intake system rather than the fuel injection system itself. Injector maintenance primarily focuses on ensuring that the injectors are working properly to deliver fuel efficiently.

Regularly checking fuel pressure is important to ensure that the injectors operate within the correct pressure range, which is critical for optimal engine performance. Inspecting for physical damage is necessary to identify any issues that may affect the functionality of the injectors. Testing fuel flow also plays a crucial role in maintenance because it helps ensure that the injectors are delivering the appropriate amount of fuel to the engine.

While maintaining air filters is vital for overall engine performance and efficiency, it falls outside the specific scope of injector maintenance tasks.