My front passenger seat won't stay upright only right bk or forward on my peugue 206 reg 2002

Kenny Richardson, March 2017

If arm release type it might need lubrication on the arm locking mechanism as it may not be locking in to upright position.
Remove the seat turn it upside down operate the arm to see what's happening. Lubricate moving parts. Put kitchen tissue down to catch lubricant drips so it doesn't stain fabric of seat.
Hope this helps

Bob UK, March 2017