Yeah thats it as far as I can tell from comparing them. The AQH has Bosch ME7.1 and the AVP has ME 7.1.1. Based on observation, that 0.0.1 difference will cause the EML to come on for faults with secondary air or secondary O2 sensors for an AVP whereas it doesn't on an AQH (logs a fault but no light), and I believe 7.1.1 also has individual control of the cam timing whereas 7.1 just does them both together. There are minor wiring differences for this iirc.
In the A8 the change from ME7.1 (FL1) to ME7.1.1 (FL2) meant a change from EU3 to EU4, however for the S8 (according to the factory documentation) both versions are EU3. Interestingly, in the UK it appears DVLA didn't spot this and so the FL2 S8 is also rated at EU4.
|