2005 Altima SER with 98K. Dealer told me my rear pre-cat was plugged and was causing the rattle in engine and SES light in my car. Replaced it (old pre-cat was very bad) but SES light still keeps coming on. Rattle is now gone. There are about 5-O2 Sensors in this car. The EGR Valve is, of course, integrated and intricate. Anyone have this similar issue? What can I check first to start eliminating?
Thanks