its reading 1.2 volts all the time across pins 1and 2 back at the ecu. took it out and it was all black, last time i took it out was when i did the head gasket and it was white (doe to antifreeze contamination) it appears that the anti freeze can kill the sensor.

i've found a replacement on here...
http://www.lambdasensor.com/main/mcolours1.htm

part no : 11014T12 - a 3 wire titania 12mm one.

only trouble is the old one is marked up as NTK D5F, this is also listed on the site but its univeral equililent is a 18mm one?

can someone whos's ordered one let me know the part no and price please.