The driving dutchman

From a costs perspective I then better first replace the precat sensor, measure the values and get my MOT emmission test. And if emissions are on the edge again I will order a new cat.
As far as I know I have the original cat under the car but I haven't checked visually. The car has run 120.000 kilometres so that's not a huge amount, normally the cat should last this long but maybe I have bad luck on that.

Check question, just to be sure: O2 sensor 1 is the precat sensor, right ?

Thanks for your help!