PEUGEOT 308 Handbook page 35

Trip reset
 When the trip required is displayed, press
the control for more than two seconds
or use the left hand thumb wheel of the
steering mounted controls.
Trips "1" and "2" are independent but their use
is identical.
For example, trip "1" can be used for daily
figures, and trip "2" for monthly figures.
Monitoring
1
33