does the closed loop operate at idle, as my car doesn't idle correctly unless the co is at about 4% ( i have to wind it down for MOT and it's not happy, stalling etc).
Also is ut possible to use the original loom, i've got an early 4x4 and there's a Triangular 3 pin plug thats not connected to anything, it comes out of the ecu loom and down the side of the master cylinder and stops next to the exhaust manifold, i presume thats the oxygen sensor cable?