Sorry, still doing battle with this...
He has now has two sensors, both producing P0130 pending fault codes, but as near I have been able to determine from him - no permanent codes.
On the bench I have tested the output of the one which is not presently installed - just a propane torch heating it up and measuring the voltage output. It shows 0.5 -is at peak.
Then I read there is more than type of O2 sensor :-(
Zirconia with an output of 0.1 to 0.9v
and Titanium with either a 0.1 to 0.9v or 0 to 5v output.
Could anyone confirm which type it should be please?
Today I helped check the O2 loom continuity from sensor to the ECU, which was OK.