In a report published Thursday, Barclays analyst Brian Johnson downgrade the entire U.S. Autos and Auto Parts sector to "Negative" from "Neutral" due to concerns in China, negative sales in the third quarter and declining production in 2016. "While the sector has underperformed over the past two months, we see potential for this underperformance to continue as China car sales continue to disappoint and as Chinese production turns negative," Johnson wrote.