Yeah, I'd say crank sensor. Easy to replace, I replaced it on my old '98 S8, and on my '03 B6 A4 3,0 quattro tip. On both cars, I accessed the crank sensor via the passenger's side wheel arch.
10mm bolt, or an allen-head one, depending on model. Took about 5 minutes after raising the car slightly.
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2006 Audi A8 D3 Quattro Sport 4.2 TDI - Silver, Family Oil Burner.
2000 Audi A4 Quattro Sport 2.5 TDI - Santorin Blue, S8-Powered DTM Race Car Build In Progress.
2000 Audi A4 Quattro Sport 2.8 30V - Pelican Blue, RS4 Widebody, D3 4.2 01E, High-Spec B5 Build In Progress.
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