I know you shouldn't just change sensors without correctly diagnosing but it seems that mechanics do the same anyway and then charge you for the privelage. I just read on here that someone had oil pressure warning and took it to a mechanic, billed him £150 to take off the sump, replace the oil pickup and the problem still persists. One of the reasons why I hesitate taking cars to the mechanic because I know they'll take me down a rabbit hole, invoice me for it and then take 2-3 attempts to get to the issue.
Anyway rant over.
I changed the pre cat oxygen sensor, was having fuel economy issues and thought why not (get 280 miles on full to red, London driving). After changing it, I did a 4 mile drive to my mums house and got the oil pressure warning (thankfully it was just before I was about to park anyway).
I check the oil, it was on the low end of the min/max marker, but not below the threshold. I topped it up and I have started the car today and run around the block a few times but the oil pressure warning does not come on. But I don't trust the car yet - hate to go on a long trip and the oil pressure to come on.
I didn't use VAGCOM to reset the data after changing the o2 sensor, I thought I'd just let it recalibrate by itself, could the o2 sensor change cause other errors to get thrown up?