Your is a late FL (like mine) model so will have lambda sensors before and after the cats - there are two, one on each bank. One is built in to the pipework on the cat itself on one side (the other side is in 2 parts IIRC).
I replaced one of my cats a while back at "significant" cost. The old cat (which had to go back as it's all done on an exchange basis) apparently had effectively nothing inside it.
I bought the car knowing it had a bad/rattly cat on one side and it got worse and noisier until most of it had been spat out of the rear.
No warnings and it still passed the MOT for 2 years! But that's no guarantee yours will be the same.
I had to have one new lambda sensor as well as it just couldn't be removed from the pipe and the wiring had to be cut. Wasn't faulty though and they did get it out eventually with major brute force. Probably ended up on eBay....
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 26th July 2015 at 06:25 PM.
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