See http://members5.boardhost.com/ukautotalk4/msg/archive/1189635923.html

I have had pretty well the identical fault (The scope readings could well be mine)

After an MOT fail, The customer had fitted a "Universal" 4 wire lambda and it was stuck at 0.8 volt (with an occasional low switch) with the live data reading 0.6v and "Lean".

(Unfortunatly the custmoer had replaced several componants so I never was really sure what the cause of the original MOT fail was though the MAF was pretty poor before I replaced it)

With a new Bosch, vehicle specific, sensor, the sensor was switching OK with a high of 1.2 volt and the live data reading 0.8-0.2 and "Rich/lean" switching.

Anybody else had this experianc?

Is there something wierd about how the Lambda works on the corsa setup or how the ECU interprets the lambda signal??