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Disconnet battery cable. Either one but I always do the ground cable. Wait 15 minutes the reconnect and see if this does not correct the problem. O2 sensor will not and does not affect idle so I assume you have another issue.
Check wiring with a test light or volt meter. switch lights to low beam, connect volt meter N probe to a good ground then probe the light socket for the low beam power cable, should show battery voltage, now switch to high beam and test for battery voltage if ok remove the grounded meter probe and probe the cable in the socket that you have not tested this is the ground cable, battery voltage should show if ground cable is ok. If no voltage repair cable ,If voltage present check filament on bulb high beam perhaps the new bulb is faulty.
CHECK ALTERNATOR FUSE AND CHECK FOR DAMAGE WIRES GOING TO ALTERNATOR.NOW IF BATTERY CABLES ARE OLD THE POSITIVE CABLE MOSTLY CAUSE HIGH RESISTANCE IN CHARGING CIRCUIT CAUSING NO CHARGE CONDITIONS.MAKE DRIVE BELT IS NOT SLIPPING KEEPING ALTERNATOR FROM CHARGING.
Check for voltage between battery Neg. and both sides of your fuse, if you get battery volts then its a ground issue, if 0 volts then its a power supply problem.
if you have a ground issue you battery Neg. cable goes from the battery to the engine block then from block to the frame. the easiest fix is to run a new (Heavy) cable from the battery Neg. terminal on the engine to the frame. and check underneath you car for a braided strap that may have come loose (this is your ground strap)
If you have a supply problem then trace the wiring from your fuse back to the source (the Battery) if need be you could run a new wire from the supply point to the fuse panel.