The knurled volume and tuning knob from the Entune head unit. It is a press-fit cap over a splined shaft, and it works loose long before anything electrical fails.
Once it starts slipping you lose the tactile detent that makes the knob worth having — you turn it and the volume does not follow. Some Toyota radio knobs are sold separately, including part 86128-0C010 for specific applications. Confirm your head-unit model and shaft dimensions before choosing a replacement.
Fitment: Entune-equipped Toyota models through the 2010s. Entune shipped in several generations with different faceplates — send a photo of the head unit or tell us the exact model and year, since the knurl pattern and shaft spline both changed.
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