Use the on-site computer diagnostics service if in your car: - the engine suddenly stalls - the gearbox does not shift gears or there is a knocking sound or jerking when shifting gears - check light comes on - the car won't start - the engine has started to run unevenly, its power has decreased - ABS, ESP, etc. do not work - climate control, cruise control, - or other electronic problems have failed. Universal scanners allow you to diagnose electronic control systems in cars of various brands.