Lambda sensor hard to change

[rendoman]

Mission accomplished!
I used 250lt\h cutting torch, I cooled the old sensor with fresh water during heating. Little force needed to unscrew the lambda. It took a bit of time searching position of some bolts, job done in 5 hours more or less.

I found also an old rubber tube (oil vapor recovery) a bit damaged, changed with a fresh one. Now the car is running as new! I had bad troubles with idle rpm, particularly with cold temperature and cold engine. I changed also coolant bulb temperature, cleaned throttle body and injector, settled idle step motor.
A good work!
Thanks for the method of boiling water, I'll keep in mind for next delicate work
Saluti
Stefano