gingeRS:

just had a thought, if you haven't yet got a new lambda probe sorted, i got mine from these guys,




Three Wire

Colour Connection
Black Ref. (out)
Red Ref. (in) and Heater (+)
White Heater (-)

part number : 11014T12

Universal Titania Sensor
Output 0 to 1 vdc

http://www.lambdasensor.com/main/mcolours1.htm

was about £70 IIRC and came pretty quick, its what im running now and mine was setup against stus calibrated wideband and using this probe we were spot on