age is only a number
AO Gold Member
Join Date: Aug 2004
Fixing bolt can either be a conventional hex head bolt or an Allen screw - but with either once you've established by feel which it is, you can access from above without too much drama - last one I did I was in a bit of a hurry and just removed the air intake ducting, and reached down to position an Allen key long end into the bolt and using a spanner slipped over the short end was able to "crack" the bolt, then spin it out with the Allen key. Sensor was a tight fit so had to get a screwdriver in to start to lever the sensor round in the hole - once it had moved a couple of times it popped out OK. I couldn't be bothered undoing all the stupid clips for the wiring on the plenum chamber so left the old sensor dangling, and just routed the new wiring loosely. Ensure that the sealing ring has come out with the old sensor - if it hasn't, remove the new sealing ring off the new sensor before fitting.....
Juggling the new sensor into just the right position for the Allen screw to engage the thread can be fiddly but easy enough.
Job took me about 15 minutes but I did gain a few scratches on my forearm from the throttle body etc.
AROC Vice-Chairman and Lancashire Section Secretary
Alfa organ donor to the gentry......