CITROËN C4 PICASSO Handbook page 294

In the event of a breakdown
Access to the spare wheel
The spare wheel is located in the boot under the floor.
Taking out the wheel
F Unscrew the central nut.
F Remove the fixing (nut and screw).
F Lift the spare wheel towards you from the
rear.
F Remove the wheel from the boot.
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Putting the spare wheel back in
place
F Return the wheel to its housing.
F Unscrew the nut a few turns on the screw.
F Position the fixing (nut and screw) in the
middle of the wheel.
F Fully tighten the central nut to secure the
wheel correctly.
F Return the box to its position in the middle
of the wheel.
As the spare wheel is narrower than the
wheels on the vehicle, in the event of a
puncture, the punctured wheel must be
carried in the boot.