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lynx-
the screengrab in OP is live data for cam angles. I have not checked engine speed sensor or cam sensors, but unlikely to be cam sensors as it is engine wide code, not bank specific. I'm not getting signal drop out in live data either, just implausible correlation, which is normally timing issue, but there isnt a timing isse that i can see visually or in the data.
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Bought an audi s6 c5 for family duties as volvo is off road for foreseeable. Am trying to chase down a possible cam chain/sensor issue. Any advice appreciated (@danstuff realise its totally different engine but maybe you have heard rumors) . Car is throwing this code through VCDS:
4.2 v8 s6 c5 avant 4B
17748 - Camshaft Position Sensor (G40) / Engine Speed Sensor (G28): Incor. Correlation
Engine is belt driven from crank to inlet cam, exhuast linked via chain to fixed inlet. This chain has a hydraulic lifter. These can get stuck closed, the solenoid can fail or the shoes can wear.
Normally however if this happened there would be various other timing related codes, I've not had any, and none are saved. I've used VCDS to measure cam angle, and both banks seem to be within tolerance set by VAG. I can hear them prime and click when key is turned. Before I take cam covers off to visually inspect am I missing anything obvious? I am also getting some unrelated and almost certainly sensor based codes from transmission, it had a bad battery when I first went to look at it, it has a new one now but its a cheap one, although it does seem to work as it should.