Just closing loop on my experience with replaceing my EPS. I tried replacing the eps drive belt first. This did not fix my issue. That was faily easy to do but wound just being a waste of about $50 and 5 hours of my time. Next step was to find a replacement EPS Rack and Pinon. If you searched for one you know there are no cheap ones to be had. Found one at Buy Auto Parts, very expensive, but a lifetime warranty. Took about 3 hours to switch out. Return the core for a refund. No need to get the computer flashed unless you get a code MIL light. No way to know...just depends on the year and make of the replacement eps. Mine worked great. You do need to get a new front end alignment because you remove the tierod ends. Mine worked great just sucks due to the cost. Water in the eps due to a bad bot clamp caused my failure . tks.
