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A power steering unit has an electromagnetic mechanism controlled by a computer-based controller for varying the steering effort in accordance with vehicle speed. The same controller is used to adjust the steering effort in accordance with a calibration value to obtain steering effort uniformity. The calibration value is obtained by applying a force to a vehicle wheel and measuring the resulting torque on the steering wheel (or vice versa) and comparing the resulting force to a standard. Any deviation from the standard is stored in the controller as a correction factor. Reprogramming the unit should cost very little unless you need to replace the various sensors and modules. I would go to a good independent mechanic to do the work and get a reasonable estimate. Go to Car Talks mechanics files at http://cartalk.com/content/mechx/find.html enter your zipcode and call a recommended mechanic in your area and get a quote on the work before you do anything else.

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