I replaced all four O2 sensors on my 2007 Vantage manual. I did the 70 to 20 rundown/misfire learn procedure at least 10 to 12 times. However I am not sure that the procedure “took.” Is there any way to tell if the procedure was completed? Any advice is appreciated.

 

found this...

Relearning the Misfire Correction Factors on an Aston Martin DB9 – Aston 1936

 

For those of us with ASM gearbox, I'd it ok for the gearbox to downshift on its own as you lose speed or do you shift into N at 70 and coast down?

 

ASM, manually paddle it to sixth gear and coast. Don't touch anything as it's doing its thing. BTW it's actually 60-30mph someone's added a bigger window to allow for it to take. Speedometer off from wheels or what have you.

 

That's great information...thank you! Where did you find that?