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Q: Intermittant vibration along with knocking near front passender wheel.

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After driving for about 5-8 miles my car will occasionally vibrate/hesitate to the point when it feels like a tire is starting to go flat. If I pull over and start driving again the vibration will stop for 2-3 miles and then return. When I pull over a third time, I hear a clicking or knocking sound by the front passenger side wheel. Some days the car doesn't vibrate at all.

My car has 94000 miles.
My car has an automatic transmission.

What you are describing sounds like a wheel bearing that may be starting to fail. A wheel bearing will usually fail due to pitting or small damage on the surface of the rollers or the bearing race. Both the surface of the rollers and the race is precision machined to tight tolerances and highly polished to allow the rollers to pass easily over the race with the addition of bearing grease for lubrication and cooling. Over time the bearing will wear slightly, allowing microscopic pieces of metal into the grease. These microscopic pieces of metal, as well as any contamination that gets into the bearing, will wear away at the highly polished surfaces causing pitting and deformation. Since so much weight is riding on your wheel bearings, and so much load is put on them in corners, even the smallest amount of surface damage to your bearing can cause a lot of noise. I would suggest having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

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