How do you change belt tensioner on peugeot 206 1.6cc?

To change the belt tensioner on a Peugeot 206 1.6cc, first, ensure the engine is off and cool. Remove the drive belt by loosening the tensioner using a suitable wrench on the tensioner pulley bolt. Once the belt is off, unbolt the old tensioner from its mount and install the new one, ensuring it's securely fastened. Finally, reattach the drive belt, ensuring it is properly aligned on all pulleys before starting the engine.