Lamda o2 sensor
I agree its not a standard part - I used a second hand one from ebay (£20 I think) and its been fine for a couple of years. I was not prepared to pay almost £200 quid - but if you can afford it a new one it should give you peace of mind.
Having said that my one was obsolete anyway and they/volvo were offering the sport mode alternative
They are easy enough to replace - and the part number is stamped on them.
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