Injector drivers produce complex waveforms reflecting both electrical command signals and injector coil inductance properties. CHEPQ oscilloscopes with high sampling rates (several MHz) reveal transient behaviors such as spike overshoot, flyback voltage irregularities, or coil saturation effects. These insights allow pinpointing issues like internal coil shorts, poor driver transistor performance, or wiring defects that manifest as rough idling, increased emissions, or fuel economy loss, which low-resolution tools might miss.