hello i hope you get to answer me

I've got a 1995 toyota avalon 390,000 miles 80k of them i put on in less than a year. i commute across 3 states for work.

engine light is on for catalytic converter and some solinoids
so is the override light it flashes

i bought it for 950 bucks with all the lights on in-fact in the same condition it is in now. it pretty much drives the exact same as when i bought it.

only thing i NEEDED to replace has been a quick strut and lower control arm from repeatedly hitting this very deep pot hole on the same wheel over the course of my driving it.

is there anything i should do to keep it on the road i regularly change the oil and i regularly check all fluids.

oh and can i pull off and trash the metal cover on the exahaust?