‘Check Emmissions Light’

Morning.

My clio 200 is a bit poorly. It’s brought up a spanner light ‘check emmisions’
The car now looses power through the Rev range, and suddenly will splutter into life. I think it’s misfiring too.

I called Out the AA, who scanned CLIP.
It show fault P0135 bank 1 oxygen sensor. Can someone please link me to the correct part? I believe there are two lamda sensors and not sure which one to buy
Thanks , Rob
 

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will be the first sensor on the manifold just before the cats....check the wiring to it could have rubbed through causing a short to earth
 
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I can get to this one using the jack?

But I think you mean there’s another further towards the manifold..?
 

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yes that one...first one controls fuelling the second monitors the first & the cats to reduce emissions