Do not forget to have a suitably sized receiving tray in place
With an oil catchment tray in position, use a 19mm spanner to carefully remove the sump plug and fully drain the oil.
When the sump has emptied, wipe clean the sump plug area with a paper towel and refit the sump plug and washer
Replace (new) sump plug and washer. Do not over tighten. replace the undertray
You must remove the undertray to access the sump plug
Remove the undertray fixings and carefully remove the undertray