My left brake light does not work could it be a fuse & if so which one do i change

can't seem to find the problem ???? That's understandable , if you don't know the proper way to test automotive electrical problems . Viewing wiring diagrams an using a DVOM - digital volt ohmmeter to test the electrical circuit is the correct way to diagnose . The third brake light works or not ? Is this what your saying ? But left an right sides don't ? Looking at the wiring diagrams I see the brake lights ,right an left or turned on by the Integrated power module (computer) Check for codes would be the first step. Not a code reader , no auto party stores , you need to have a qualified repair shop with a professional scan tool check it .

Have you checked the fuse under the bonnet? 15 Amp fuse marked in red on the photo below.

If the other brake light works, it is not a fuse problem,
common sense

If a fuse ever does blow, you have to find out why

Replace a blown fuse & it will blow again 9 out of 10 times

Replace the lamp if it is burnt out.

The flasher does not stop the brake lights from working. Check # 18 fuse in fusebox under lower left side of dash. if it's ok, the brake light switch, on the brake pedal arm is next. light green wire with red stripe is hot if fuse 18 is ok. Depress brake pedal, light green with no stripe should have power. if not, replace brake light switch. If light green wire has power with pedal depressed, combination switch under the steering is next. Remove the cover from around the combo switch {under the steering wheel}. depress brake pedal, light green wire should have power. If it does, pedal still depressed, orange with light blue wire & wire with light green & orange should have power. Those 2 wires are brake & rear turn signal wires. { The turn signal switch should be in the middle, not right position or left. while checking for power in the last 2 wires. Good Luck drvolt.

did you check the VEH STOP fuse? #34, 15 amps, in the rear fuse block, under the left rear seat.

clean socket then apply electric grease and bulb dont use that bulb i think its got a issue had same thing and that cured mine let me know

Are your hazard lights and/or reverse lights working? I can't remember which ties in with your brake lights but one of them do.

If you have the owners manual for this car look in the index for fuses. This will give you specific location of which fuse protects the brake light. Fuse block is typically located under the drivers side dash, near the floor. Have you changed the bulbs?

These are Dual Function Bulbs. They control the Parking Lights and the Brake Lights. This Bulb is Burnt out on the Brake Coil inside the Bulb. I have actually seen Bulbs that were Bad But you could not Tell by jast looking at them. It should be fine with a New Bulb. Please Rate My Response! Thanks!

the blinker is behind o next to the brake pedalit coul be the problem brake ligth swich is ataached to bhe brake pedalhold by two screws o pins first check for groud o positive