Fix or buy another car

Update: I took the Subaru into the dealer and the ECM update was done. They told me that it didn’t fix the catalitic converter problem, although I’m not sure how they know that. They also told me that there was no oil on the dipstick. They said the oil pressure switch is leaking. Also an axle boot is torn. Two control arm bushings are torn. They also said the timing belt is worn and the drive belts are cracking.

They quoted around $2000.
I have an appointment with a mechanic I have a good relationship with. He said he thought he could do this stuff for probably 60% of the dealer price. I have an appointment with him this wednesday to confirm.

So with this new info should we buy another car or do the repairs?
CarMax offered $9000 for it a couple weeks ago.