2001 Mitsubishi Eclipse GT 3.0L

2001 Mitsubishi Eclipse GT Hatchback 2 Door Description

Sunroof, hatchback, newish tires, leather interior, power seats, power windows
Selling because I bought a truck, this car is too small for my needs.
Its been a reliable car, we've spent a lot of time on the freeway together.
It has a few issues:
dashboard is cracked upTags expired in Oct, needs smogged.Check engine light is on, I've already had the codes run, its P0421: Catalyst system efficiency below threshold (Bank 1) and P0431: Catalyst system efficiency below threshold (Bank 2). Very likely just the oxygen sensors. (it's idling rough and low at cold start, so it seems very likelyto me to be the sensors)There is an oil leak from (I believe) the timing belt area. It's either the camshaft seal or crankshaft seal. It's a $20 part, but its a pain to get to. I've been running it with the leak, and just adding oil.
Had a mechanic give it the once over. He agrees that it's likely the O2 sensor.