How do you change citroen Picasso idle pulley?

To change the idle pulley on a Citroën Picasso, start by disconnecting the battery to ensure safety. Remove the serpentine belt by loosening the tensioner pulley, then detach the idle pulley by unscrewing it from its mounting. Once the old pulley is removed, install the new one by securing it in place and reattach the serpentine belt, ensuring proper alignment. Finally, reconnect the battery and check the installation by running the engine briefly.