What should a mechanic test for pressure loss?
A useful test plan for pressure loss verifies the operating state first, preserves scan evidence, and measures the competing tires & wheels paths before any component is replaced.
Plausible causes
- Tire, wheel, pressure, or rotating-assembly concern
- Pressure loss or structural tire damage
- Balance, runout, road force, hub, or bearing
Useful next checks
- Leak, tread, sidewall, wheel, and torque inspection
- Radial/lateral runout and correct-centered balance
- Road-force variation measurement
- Hub, bearing, brake, alignment, and suspension inspection
Sources and method
This answer provides hypotheses and a verification plan, not a component verdict. Exact repair procedures require authoritative service information for the specific vehicle.
TireWise · NHTSA