Reverse Lights and Tail Lights not working. Checked all fuses and replaced all bulbs and still not working.

some bulbs have dual filaments in them. One for tail lights and the other for brake/blinker lights.
Many times one element will burn out but the other will still work.

Try replacing the bulbs.....assuming you have already checked the fuse for the brake lights. (many cars have the stop and back up lights on the same fuse)

The only thing that both the brake lights and tail lights use is a ground connection. Keep in mind the warning light on the dash may be for any exterior lamp. You may need to check the sockets and grounds on all four corners of the car.

Suspect the multi-function switch. (turnsignal) these fail a lot.

most blinkers uses relays, and when they flashes fast one light is out, but you replaced your burnt bulb might be a bad relay.

I am unaware of what a "CO" display is.
Now with the blinkers, hazard, horn and brake lights not working that may be the multi funtion switch (blinker switch) that is located inside the column (where the blinker lever attaches).
Obviously the blinker, hazard and horn will all work off of something in the column. Brake lights, you may think a switch on the pedal.

the brake lights do work with that switch but when you have the kind of tail lights where a turn signal light shares the same bulb as a brake light, the brake light is cancelled for the turn signal by running through the multi function switch inside the column.
The third brake light does not blink so its not on that same circuit.

I've worked on these the first drove me crazy. its the turn signal switch every thing runs thru these. head lights, turn signal, brakes. except the third brake light. it runs directly from the brake switch. go figuare

TEST FRONT RIGHT BLINKER CIRCUIT AND REPLACE THE BULB,,WITH PROPER BULB...A DOUBLE CIRCUIT BULB IN A SINGLE SOCKET WILL DO THAT ALSO A SINGLE SOCKET BULB IN A DOUBLE SOCKET HOLDER....CHECK LEFT SIDE BULB FOR ACURANCY

DID YOU CHECK THE BULBS?

check for a short it could be anywhere in the line

have you checked the bulb sockets to see if they are burnt or corroded sometime i see that the plastic melts around the contacts where the socket twists into the housing. if your lucky you might get away with replacing just the socket for the brake/running light bulb. but if it is too melted your most likely going to need a new housing