Hi I've had the same issue with the power steering assistance failure on my 2011 Ford Explorer. Late last year (2019) I brought it in to the dealer when they did the toe-link and exhaust rotten-egg smell inside the vehicle recall. I told them every couple of weeks to a month, the power assist warning comes on and it would work if I turned of the car and restarted. They said that the recall said to reprogram the ECM to the latest software to fix it. They performed the update, which was also required by the exhaust warranty. It didn't fix the power assist failure and every month I have to reset, but it turns back on. Now it does not reset. I brought it to them and they said there is a recall, but it was for if it had less than 150,000 miles. I checked and it was less than 150k miles (149k) when I brought it in December when they did the reprogramming and asked to fix the power steering assist failure. Now at 159k miles, I explained this and they verified the ecm was updated and in before 150k and it didn't fix the issue, he said it cannot be under recall because it is now 159k. How do I push this decision up the chain since I had brought it in for that problem when it was under 159k miles? My family has just about every generation explorer: 95 Explorer (375k miles), 2006 explorer 230k miles, 2012 explorer 220k miles, 2007 Ford Edge 160k miles, and this 2011 Explorer with 169k miles. These have been excellent, reliable cars. Trying to figure out the power assist failure issue. Thanks,Paul