From memory I think it's in the ECU box under the bonnet, tucked away under the engine ECU. Andrew will know as he's been ferreting in that area in the past looking for evidence of leaks.
Is the valve body loom accessible without removing the sump from the box? I know there's a plug for the F125 switch but not sure how many others are on the outside of the box. If it's driving fine it does suggest it's probably just gremlins in the machine/a small electrical fault from the wet winter we've had. I'd clear and see if they return before worrying too much.
Airbag is probably a dodgy connection too
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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
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