Hi I have 2007 Nissan quest. Replaced ALL
sensors (including cam and crank shaft sensors)
and all catalytic converters. I have also replaced
the engine and cleaned all injectors. Still "service
the engine" is on. Any advice??
First you should have had the vehicle read for codes and written them down. It is possible that your vehicle is telling you that an oil change "service" is required. I am not all that familiar with the Quest. Lastly, stop wasting money and throwing parts at it. Take it to someone that knows how to work on it.