I'll be honest,never done one in a Citrroen,plenty of Peug's though.
so advice is based on these,your right they're at the back of the head,obscured by the egr pipe system.not really that hard to remove,then you can see the g/plugs,12mm hex heads with the wire fastened with 8mm nuts.
be warned,these are really long plugs,very fine thread so go easy,if one binds,screw it back in,then back out.
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