On the front of the engine inside a plastic cover with a 27mm "nut"
The diesel engine Citroen C3 have the fuel filter located in the engine bay, under the air intake pipe to the air filter. There are some pictures on this forum post: http://citroenc3owners.com/diesel-c3-tips/how-to-change-the-air-filter-on-a-citroen-c3-1-4-16v-hdi-t80.html and some instructions to remove the diesel filter here: http://citroenc3owners.com/diesel-citroen-c3/changing-the-diesel-fuel-filter-t102.html The petrol engine Citroen C3 has a filter in the fuel tank that lasts the life of the car.
Its under the turbo air inlet pipe in the engine bay. there are some photos of the Citroen C3 HDi fuel filter in the forum link http://citroenc3owners.com/diesel-c3-tips/how-to-change-the-air-filter-on-a-citroen-c3-1-4-16v-hdi-t80.html http://citroenc3owners.com/resources/citroen-c3-hdi-air-inlet-pipe-lower-mounting-point-inlet-pi/54
Its in an air box, at the back of the engine. (Between the engine and the firewall) There are some pictures here http://citroenc3owners.com/diesel-c3-tips/how-to-change-the-air-filter-on-a-citroen-c3-1-4-16v-hdi-t80.html The 8 valve version needs the 3 screws to be removed from the lid to access the air filter. The instructions for the 16v are more complicated and are here http://citroenc3owners.com/diesel-c3-tips/how-to-change-the-air-filter-on-a-citroen-c3-1-4-16v-hdi-t80.html
OAT Coolant.Mix the concentration dependant on your country (lowest temperature).seehttp://citroenc3owners.com/citroen-c3-tips/citroen-c3-coolant-t40.html
Total Quartz Diesel 7000 10W-40 ** Total Quartz 9000 5W-40 ** Must not be used on HDi engines with particle filter
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....
Yes, in the C3 Picasso at least.
The diagnostic plug is in the glove compartment in C3
You need to remove the battery and bracket then you will see a black Plastic thing and that is where you can top up the oil
NO