Hi Jim,Most people see the light go off immediately and almost everyone else sees it go off within 2 days of normal driving, assuming they don't have VCDS to clear the code. The fact that you are now seeing .7v on the low end gives me confidence that you are good to go.
The last time I installed it I also got this 0.680v reading, but upon the light coming back on I found that the voltage was still 0.380 - so hence me looking under the bonnet - I found it had twisted - Lets just assume I hadn't tightened it properly then on the first occasion (see above for the other error codes I found upon scanning - so perhaps it caused these other codes when it became loose?
I've scanned the code again now - the car has only been moved about 50 feet though to be fair and the fault is still there (the error code anyway) - the readings are still around the 0.7 value (0.680). Pictures and video below: