CSK Auto Corporation Announces Sale of (AIS)Automotive Information Systems Company It Purchased in 1999

PHOENIX--Jan. 2, 20054, 2005--CSK Auto Corporation announced today that on January 21, 2005, CSK Auto, Inc. (CSK) sold all of the issued and outstanding capital stock of Automotive Information Systems, Inc. (AIS), dba Identifix, its wholly-owned subsidiary, to Mobile Productivity, Inc. (MPI). AIS provides diagnostic vehicle repair information to automotive technicians, automotive replacement parts manufacturers, automotive test equipment manufacturers and do-it-yourself consumers.

As consideration for the sale, CSK received a senior secured note in the amount of approximately $12 million, which is convertible into shares of MPI common stock under certain circumstances. CSK also obtained a license from MPI to utilize certain software products made available by AIS, and the right to designate one member of MPI's Board of Directors, in accordance with the terms of the transaction agreements. CSK does not expect that this transaction will have a material impact on its financial statements.

CSK, a wholly owned subsidiary of CSK Auto Corporation, is a specialty retailer in the automotive aftermarket. As of January 2, 2005, the Company operated 1,130 stores in 19 states under the brand names Checker Auto Parts, Schuck's Auto Supply and Kragen Auto Parts.

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CSK AUTO CORP. Chairman and CEO Maynard Jenkins doesn't want to give away "the hold card" when discussing the retailer's future. However, it's obvious as CSK continues its growth through acquisition mode that a new approach to parts distribution is taking shape. In June, the Phoenix, Ariz.,-based company became the first auto parts retailer to launch an e-commerce website (www.cskauto.com). Now CSK has acquired Automotive Information Systems (AIS), a provider of diagnostic vehicle repair information to automotive technicians, automotive replacement parts manufacturers, automotive test equipment manufacturers, the do-it-yourselfer and Microsoft's CarPoint website. CSK will pay approximately $10 million in cash for the St. Paul, Minn.- based AIS, and will fund the purchase through its senior credit facility. "We said when we went public that the diagnostic issue in auto parts retailing was going to be a huge issue in the future," said Jenkins