That depends, petrol or diesel?
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.
75,000 / 80,000 miles petrol C3 HDi every 150,000 miles
OAT Coolant.Mix the concentration dependant on your country (lowest temperature).seehttp://citroenc3owners.com/citroen-c3-tips/citroen-c3-coolant-t40.html
On the front of the engine inside a plastic cover with a 27mm "nut"
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....
The diagnostic plug is in the glove compartment in C3
Yes, in the C3 Picasso at least.
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