probably the brake light switch on the pedal if none are working at all
If the back lights on a Peugeot 206 are not working, make sure the bulbs are new. If the bulbs are not the problem, there could be an issue with the fuse.
check little switch under your brake pedal....... and check brake fluid. This was the problem on daughters 206 . Topped up brake fluid on now ok.
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ECU defekt.
there is a wire and plug jus under your glovebox in the pasenger side footwell. if you plug that back in the lights will work properly again.
Depends
A similar car to the Peugeot 206 is the Peugeot 205 which the Peugeot 206 is modeled after with minor modifications and upgrades from the Peugeot 205 to the Peugeot 206.
cos it sounds noisy!
Could be switch on gearbox, wiring or bulb.
Possibly a defective brake light swith stuck closed.
engine fault/oil low/water low .brake fault