Phantom interior lights in '92 buick park ave. lights come on and go off themselves

SOURCE: 98 buick park ave, hard to start, run's rough. po172 code

oxygen sensor in exhaust

SOURCE: 1999 Buick Park Ave Ultra Service Engine Light

The code PO742 indicates the torque converter clutch is stuck on.
The torque converter is what connects the engine to the transmission.
It engages and disengages according to signals from the pcm, to aid in
smooth shifting. There are a couple of things you can try. make sure trans. fluid is full, if thats ok check the 20 pin connector, located on left
side of car on top of transmission bell housing. Make sure there's no
corrosion or bent pins. If this clears the code your all set, if not you may
want to ask your mechanic and see what he/she recomends.
Hope this helps.
Good luck