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ensuring proper emission system function
OEM Part Number: 11531438634 - exact cross-reference
Make Model Years Engine BMW 745i 2002–2003 4
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OEM Part Number 31126855741
Belt Tensioner Roller - Priced Each Aftermarket ensuring proper emission system functionThis tensioner pulley helps maintain proper tension on the accessory drive belt. Grinding or whirring noises coming from the pulley are signs that this component is about to go. While replacing this component, check all of your rollers for wear. If the rollers feel like they are grinding or are difficult to turn, replace them immediately.