I've just come on with a similar issue, mine is at 6% and need it to be 3%, my tickover is approx 1200 so I heard to reduce the revs but the screw is already on its seating! I've got the Lucas Hotwire system and have been told it might be a problem with that but know they can be expensive parts
Got it sorted, my local landrover garage warmington hill did a fantastic job and put a Japanese chip into the loom and got the co2 from 13% to 0.3%. Needless to say it flew through the MOT.
Can't say how chuffed I am and would recommend the garage to anyone.
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