Quick update:
I fitted a new (used) part today which I sourced from EBay. The donor car was Q7 in the end and I paid £60 delivered.
The green beast certainly seems to drive better post part swap. I’ll monitor it over the next few weeks to see how it plays out. Normally I’d be driving the 8 more often, but since the COVID-19 outbreak I’ve been getting 4 weeks to the gallon
Thanks MJ and Andrew for the help - it was pretty straight forward to fit and then clear the error code afterwards. Took me about an hour all in with basic tools.
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor
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1988 E30 Coupe - Royalblau Metallic
2003 S4 Avant - Light Silver Mettalic
2016 S5 Coupe Black Edition - Ibis White