I have a service engine soon light on. Took it to the shop and the mechanic removed and replaced variable valve Timing Solenoid, adjusted the camshaft solenoid, and added Archoil Friction Modifier.
The next day the warning light is back on. Mechanic says to drive it on a trip long enough to get the engine oil warmed up as stop and go driving doesn't do that. So I drive 120 miles round trip at speeds from 55-90mph with out stopping.
The light is back on! Ideas?
