That sounds like the torque converter is dropping out of lockup and back in again rather than anything else. You could try scanning the auto transmission rather than the engine to see if anything is recorded there.
The torque converter issue was a fairly common issue on the D2, but the next step after that was usually transmission failure. Do a search for A8 transmission thump.
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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