Shares of auto parts makers like BorgWarner Inc. (BWA) - Get Report , Tenneco Inc. (TEN) - Get Report , and Lear Corp. (LEA) - Get Report were declining Tuesday as dismal auto sales data in July impacted the entire industry. 

Fiat Chrysler Automobiles (FCAU) - Get Report reported a 10.48% decline in July unit sales vs. the market's expectations of a 7% drop. Ford Motor Co. (F) - Get Report reported a 1% decline in retail sales and General Motors Co. (GM) - Get Report reported a 15.4% decline in unit sales vs. analysts' 9.1% decline expectations. 

As a result, Lear shares were down 2.5% to $144.46, Tenneco was falling 2.3% to $54 and BorgWarner was down 2.95% to $45.36 per share in morning trading. 

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