My local ECU repairer fitted a second hand mass meter,which he thought was ok, but it didn't fix the overfuelling problem, so i spoke to my customer & put him in touch with the ecu repairer who suggested fitting a resistor.I spoke to the ecu repairer today who told me that they ended up fitting a mass meter from another a class,which was running lean,but got the lambda switching & he thought that something else was causing it to run rich, but i suspect that if i had fitted a new genuine ecu in the first place that the problem would be sorted.I know next time that i will as i am fed up with wasting so much time & it also doesn't look very professional having to keep sending the ecu off for repair. Just for reference,i have taken some readings from an A140 which has no faults using the Multiscan;as follows eng speed 854 rpm coolant temp 74 deg c oil temp 32 deg c ign angle 6 deg o2 control 0 % throttle angle 2.6% Air Mass 88kg/h HFM-SFi voltage 1.9 v inj 4 ms