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Wrap-up: There's only one cam sensor at the rear of the left bank cylinder head on this 12V AFC engine. The Bentley calls it G40, so the VCDS report of G163 was apparently a red herring. There is no G163 on the engine. The actual issue in this particular car was a broken left camshaft...

I fully concur, thanks! I'll just add one more data point that I noticed from viewing actual photos of used 8D0906266B ECUs on eBay. Most were "MMS-411B" like mine, but one was "MMS-411C" despite having same ECU part number with "B" suffix. I have ordered a 2-channel scope. A 3-chan was out...

Good thought, but please read my post #14, last sentence. To recap, it's simply not possible to mount one of these particular Hall cam sensors at the front of a single-cam head. The twin-cam heads can only because they drive the second cam internally rather than with the timing belt.

I'll PM you the VIN. The car's been in the family since 2010 or so. It had been sitting unused during Covid, but fired right up last fall and I drove it 1/4 mile or so with no running issues. When I came back a month or so later, the AC compressor had seized so I had to remove the belt to let...

Just to clarify, how does VCDS differentiate G40 and G163 for engines that do have both? Iif just one, is it always called G40 regardless of location (e.g., right bank #1 or left bank #2)? On this '95-'97 AFC 12V engine, the Hall-effect cam sensor at the rear of the left bank #2 is called G40...

Much appreciated, Thank you! 1. I stand corrected! According to ETKA 7, the 2.8L 12V code AFC engine came in the 1995 Audi 80/90Q for USA as well as the 1996-1997 Audi A4 for USA, but it looks like 2.8L 12V code AAH came in 1993-1994 80/90Q for USA. 12v.org has a great ECU wiring diagram for...

Are you sure? This is a USA model year 1997 2.8L 12V A4Q with AFC engine code. The door-jamb production date is 10/96. I still can't find a G163 or second cam sensor to test, nor its harness connector. This engine only has one left bank camshaft and one right bank camshaft. ETKA only lists...

Thanks, that's interesting if Canada got a newer gen ECU for the AFC than the States (usually the opposite), but mine is definitely a States car and I'm afraid p.112 is referring to a 2.8L 30V since it says the 2 cam sensors are on the two "intake" cams and only the 30V has separate intake cams...

Thanks @nugentp ! I've found the AAH wiring diagram (see https://12v.org/engine/index.php?section=hw&ver=3), but not yet found the AFC WD. I'll have to go back and check voltages next weekend. But for the AFC, there's conflicting info over whether the G40 harness connector pins 1-3 voltage...

If you only have a screenshot or picture of the Autoscan, I think you could try attaching that.

There's an issue with the VCDS codes. The car is No Start. The timing belt is good and properly aligned. Here's the engine scan: -------------------------------------------------------------------------------- Address 01: Engine Labels: 8D0-906-266.lbl Control Module...