It's not "dealer only", and all you need is a small wrench (m.b. even a screwdriver, I don't remember) and a digital voltmeter/multimeter. Do you DIY? If so, get a manual (techinfo.subaru.com, alldatadiy.com, local autoparts store, P2P), and do it. If you have doubts, get it to a dealership and pay, pay, pay to get it fixed.I've looked at a couple of manuals. One looks like its a subaru dealer only adjustment. the other talks about a feeler gauge and voltage measurements. I was just looking for some insight before I buy a new or used TPS.