Blinker issues Blinkers will not work when using the lever, but light up when I turn on the emergency lights. No owners manual and am unaware of which fuses to check.

If your brake lights are working, then the wiring to the turn signals are good. Check the turn signal flasher which is under the dash. Try your emergency flashers. Do they work?

Turn the 4 way switch on and off several times. Sometimes the connection that goes from turn signals and emergency
lights get dirty.

The hazards use a separate relay. listen for signal relay clicking to locate the correct relay. Consult your owners manual for fuse and relay layout.

I bet your blinker flasher is not working. Most likely it uses two flashers, my Intrepid did. Somewhere (probably near the fuse box) and likely under the dash you will see a board with relays and stuff plugged in. You will also see two round things, those are most likely the flashers. Swap them if they are the same, then your hazard lights won't but your blinkers will, at least until you get to the store to get a replacement.

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.

Sounds like the blinker relay. Is the emergency flasher switch on the dash above the radio ? If it is the blinkers relay is the same as the emergency relay. If the blinkers stop working pound on the emergency lights switch and if they start working then replace the emergency lights relay switch cause the blinkers is on the same relay as the emergency lights. My 2001 Grand Am does the same and I just hit the emergency lights switch and they start working again.

You can check your blinker relay located in the fuse box. You should have 2 of them. 1 is for the emergency blinkers. Trade them to see if this corrects the problem. The other issue could be the multi switch is not functioning properly all the time.

Hello Durant.
Your rear signal lamps are turned on by the body control module (BCM).
You could have some broken wires from the BCM to the rear signals or the BCM isn't providing power to them. The BCM must be getting a signal input because the front ones are functional.
If you want to trace the wires here are the colors you are looking for.
Left rear wire is white/dark green.
Right rear wire is white/brown.
You may need to have your BCM scanned to verify.
If you would like more information to solve this yourself ask me.

The right blinker issue sounds like you have one bulb out either front or rear check them both. The left blinker issue sounds like either bulbs(both out) or fuse, or worst case blinker switch has gone bad on left turn only so not picking up the signal.

It sounds like a bad light socket. The brake light and the parking/running/regular part of the socket are shorting out. When you press on the brake petal it's shorting out on the turn signal and sending current to the indicator (arrow) on the dash.. When you use the blinker, it's shorting with the brake light and causing them both to flash...

Check the socket and get back to me with the result.