I just changed a lambda sensor on my Rover V8. It was solid and I couldn’t budge it with an open ender and stopped trying before damaging the hex nut part. Plenty of Plusgas used.Fault was open heater circuit in downstream sensor. OBD unit identified it. Tested both L and R. Twin exhaust system. R one was the faulty one. Ordered replacement from Rimmer Bros. Got my MOT garage to replace it due to my failure. They had to use a blowtorch to release it. They are notorious for being b******s to get out. Now ok. Car has done 73k miles so not bad life.
Same sensor use pre and post cat. I got the pre-cat one out easily to look for ID but couldn’t track a new one down until finding the ID on the Gems system manual.
