P0150 O2 sensor circuit malfunction (Bank 2 Sensor 1)

This code keeps coming back. At the moment, it's showing as 'intermittent'

I opened up the ECU box, and re-soldered the LPG connection for lambda2. This has been double checked, and is fine.

Could this be due to a failing sensor?

I was watching the live-data earlier with it idling

Bank 1, sensor 1, was cycling between I think 39 and 700+ mv, whereby Bank 1 sensor 2 (the one it's moaning about) was sat solidly on 39mv, occasionally going to 59 and then back down.

when I revved the engine, the bank 2 sensor 1 values rose - and after a while, it was cycling the same as bank 1.

Duff sensor? Same problem as Mr Gixer?

Many thanks in advance 

lambda sensors recommended service life is 100 K (kms) .. when they get old their responses slow down until they finally give no reading..

replace in pairs best I guess? Cheers LD and everyone..   

Easier side that one, open ended 22 seemed best weapon due to space. Came out easy in my case. Routing the cable was bigger issue, but you won't have the gear box selector switch and linkage in the way. I just changed the ify one.