Catalysis of the reaction: 1-acyl-2-(9Z)-octadecenoyl-sn-glycero-3-phosphocholine + 2 Fe(II)- + 2 H+ + O2 = 1-acyl-2--sn-glycero-3-phosphocholine + 2 Fe(III)- + H2O.
oleate Delta(12)-hydroxylase activity