The Cheapest Diagnostic Tool in the Shop Is Your Hand
A customer brought in a truck that clunked over every driveway apron. He was ready to buy control arms. I put one hand on the tire, rocked it, then repeated the test with the brakes held. Different feel, different fault. Turned out the sway bar link had a worn joint. Before replacing parts, get the wheel off the ground and feel what changes under load. Your hands catch plenty that scan tools miss.