It is the button on the Dash board just below the green flashing light of the right turn indicator
Operates when ignition is on. After the trip mileage record is displayed a long press of this button resets it to zero.
To reset the service indicator Citroen C3, push the button on the instrument panel. Hold it for 10 seconds while turning on the ignition.
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Press and hold down the trip reset button on the dashboard with the ignition switched off.Turn on the ignition while still pressing the trip reset button till you see zero on the screen. Switch off the ignition and it should reset your service clock.
You press and hold down the trip reset and then turn on the ignition. The LCD odometer display then counts down and when gets to zero the service reminder has been reset. This also works on a Picasso.
OAT Coolant.Mix the concentration dependant on your country (lowest temperature).seehttp://citroenc3owners.com/citroen-c3-tips/citroen-c3-coolant-t40.html
There are many features of the Citroen C3 Picasso. Examples of some features of the Citroen C3 Picasso includes an anti-lock breaking system and remote central locking.
Red OAT antifreeze and coolant. Premixed will be easiest. See the link for more information: http://citroenc3owners.com/citroen-c3-tips/citroen-c3-coolant-t40.html
NO....
To reset Citroen C3 immobilizer if the car won't lock or unlock: Unlock driver door manually, get in vehicle and close all doors. Put key in ignition and switch to on position. Hold down the lock button for 10 seconds. Switch ignition off and wait 30 seconds. get out of car and lock.
Press in and hold the trip reset button. Switch on the ignition keeping the button pressed.
To reset the engine management light on a Citroen Picasso, press and hold the trip reset button. Turn ignition key to position 2. By keeping the button pressed in, the trip meter will count down. When zero is reached, release the trip button and the start car service light will be extinguished.
The diagnostic plug is in the glove compartment in C3