Fault code P0130

Hi all,

just after a bit of advice really, got in the car before and it didn't feel quite right, the flat spot was worse than normal even when it had warmed up and it was idling rough. Around 100 yards down the road got the spanner light and "check emissions"

Checked it on a fault code scanner and the error is P0130 which I believe is the pre-cat lambda in the mani.

Can the sensor be changed without taking the manifold off?

Would the flexis blowing slightly be the cause of it? I've got a feeling that at least one has been blowing, obviously if the mani needs to come off for this I'll get both sorted at once but was planning on only sorting the blowing out in a few months due to how much of a ballache it is