L322 Just replaced front air bag

A mates range front air bag has gone so he said, as ride height in front has dropped too the off side front, fitted him. The replacement all looked good the car Sat up drove around 1hr later it's Sat back down all Rd on the stops any ideas does it need a reset or a leak some where else or a dodgy ride height sensor all advise welcome

Ooer missus!! Go back to the last thing you did and see if there are any leaks from the fitting you have disturbed. A bit of soapy water will help with leak detection! Try remember if there was anything you had to remove that may have been overlooked! Good luck!