I jumped in this Ford Focus and it had a wicked vibration at idle — you could feel it through the dash and steering wheel, and the whole car was shaking. In this video I show you how I diagnose that kind of vibration the right way on a 2011–2018 Focus SE with the 2.0L and automatic. Instead of guessing, I use a floor jack with a block of wood and lightly lift the engine to see if the vibration pitch changes. When the vibration almost went away as I jacked up the engine, that told me the main upper engine mount was collapsed. After confirming it, I walk you step-by-step through replacing that mount. I support the engine, move the coolant reservoir out of the way (without disconnecting the main hose), then remove the fasteners and swap the mount. I also explain what’s happening when these mounts fail — they collapse and you end up with metal-on-metal contact that transfers vibration right into the cabin. Once the new mount is in, I snug everything, lower the engine onto the mount, and torque the bolts (59 ft-lbs on the 15mm bolts and 66 ft-lbs on the 18mm bolts). Fire it up, and the vibration is basically gone.