AutoZone, O'Reilly fend off Amazon and Walmart in battle over auto parts market ... for now

Stores that sell car batteries, mufflers and other parts are facing new pressure since Amazon started selling auto parts online last year. Big retailers like Walmart have also jumped into the fray, in part, to compete against Amazon. So far, auto parts retailers have been spared from sharing the same fate as Barnes & Noble, Toys R Us and so many other companies rendered redundant by Amazon.