Bearing swapped. Drone's still there.
Sound familiar?
Every workshop has been here. The customer complaint is real, the diagnosis seems right, the part gets swapped — and the noise is still there.
- Wheel bearing swapped. Drone hasn't changed.
Misdiagnosed bearing side is one of the most common NVH errors. The drone continues at speed because the vibration source was never on the side you replaced. - Mounts replaced. Vibration's still there.
Engine and gearbox mount replacements for vibration are a common speculative fix. When the vibration persists, there's no obvious next step — just cost already sunk. - Charged for the last fix. Rattle's still there.
The customer has paid and now expects a free redo. Rattles are the most common vague NVH complaint, and the hardest to pin down without measurement. - Ran every diagnostic. No fault codes. Still runs rough.
Scan tools find electrical faults. They can't find mechanical ones. When the tool gives you nothing, NVH diagnostics picks up where electronics leave off.