Rear Wheel Bearings, 2002 boxster s

I would think you need to check the brake system or the wheel bearings on that wheel.

Wheel Bearings

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Adjustment

2002-05 Models

1. Before servicing the vehicle, refer to the precautions at the beginning of this section.
2. Remove or disconnect the following:
   
   Rear wheel Brake drum Hub cover Cotter pin Lock nut cover
3. Adjust the locknut to achieve wheel bearing play of 0.001-0.006 inches (0.025-0.152 mm).

Removal & Installation

2002-05 Models

1. Before servicing the vehicle, refer to the precautions at the beginning of this section.
2. Remove or disconnect the following:
   
   Rear wheel Brake drum Hub cap Cotter pin Lock nut cover Lock nut Wheel bearing retainer washer and the outer wheel bearing Hub assembly Grease seal Inner wheel bearing
3. Clean and inspect the wheel bearings and races for unusual wear or damage. Replace parts as necessary.

To install:

1. Pack the wheel bearings with grease for assembly.
2. Install or connect the following:
   
   Inner wheel bearing Grease seal Hub assembly Lock nut. Adjust the locknut to achieve wheel bearing play of 0.001-0.006 inches (0.025-0.152 mm). Lock nut cover Cotter pin Hub cap Brake drum Rear wheel
   

Would sooner think wheel bearing,should be able to hear the noise or feel play in the bearing if jacked up. Abs light on? often a bad bearing will get metal in the sensor and turn on the ABS light also.

not easy,you will probably need a hydraulic press to remove and reset the bearings

You need a wheel bearing....don't drive it. Tow it to a dealer.! Ford wheel bearings are cheaper than aftermarket.
250-300 dollar fix.

how to change rear wheel bearing on vw. beatel 2002 1.9

The rear wheel bearings is a bolt in hub unit and is not separately serviceable on this car.

Any attempt to replace just the bearing will have to involve pressing the bearings out then taking them to local bearing suppliers and having replacement units sourced or made based on the dimensions, as their are no correct listings available for this application.
The cost would far exceed the $300 for the hub, and quickly.

change the brakes , the wheel bearings too should be ok

did they check the other wheel bearings? some time a wheel bearing noise will travel and sound some place different.

Remove the drums and check your rear brakes. If okay, you may try testing a couple different tires in the rear. Belts separating and flat spots show worse at higher speeds.
It could be bearings if truck is used alot while loaded. Remember 1/4 ton is only 500lbs. High miles, hard driving, or if it was wrecked in rear could all cause these smptoms.