I have had my lx450 for about 7 years, and for the most of it my engine light has been coming on frequently, recently I have replaced both o2 sensors, egr valve, oil change. plugs, wires... what do I got to do to solve this annoying problem, Lexus diagnosed it as o2, then egr, and now they want 95.00 an hour to search for electrical problem!! also my gas milege has worsened dramatically over the years please help with any advice you might have, truck has 110,000 KM. or 70,000 M.