Peugeot 405 open bonnet when release is broken?

If the bonnet release mechanism of a Peugeot 405 is broken, you can try accessing the release cable from inside the vehicle. Remove the interior panel or kick plate near the driver's footwell to locate the cable, then pull it manually to open the bonnet. Alternatively, you could use a long, thin tool to reach the latch through the grille. If these methods fail, it may be necessary to seek professional assistance or replace the broken release mechanism.