Depending which lambda sensor, they're not too bad to do. One is high up on the offside, but the nearside ones and the offside rear can be accessed easily enough and the wiring just runs through the floor of the car into the cabin.
Cost about £100 and ideally needs a cheap tap (under £10) to clean the threads before putting the new one in. One looked mullered on mine but after re-tapping the replacement went in fine.
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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