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          Genuine BMW 12311713143 - Accessory Drive Belt Idler Pulley Cap

          MPN: 12311713143
          The Genuine BMW 12311713143 Dust Cap preserves belt tension for optimal engine performance. Crafted for durability, it fits various BMW models with ease.
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $1.13
          In stock

          Product Overview

          The Genuine BMW Accessory Drive Belt Idler Pulley Cap, part number 12311713143, is a precision-engineered component designed to maintain optimal performance and longevity of your BMW vehicle's accessory drive system. Manufactured from high-quality materials, this cap ensures excellent durability and reliability, protecting the tensioner assembly from dirt and debris. Its perfect fit and OE-level quality make it suitable for a range of BMW models, ensuring smooth engine operation and enhanced efficiency. Choose Genuine BMW 12311713143 for dependable performance and peace of mind every time you service your vehicle.

          Cross Reference Numbers

          This Genuine BMW 12311713143 is equivalent to or replaces the following part numbers: 12 31 1 713 143, 12311713143.

          Vehicle Compatibility

          • BMW Z4 M Roadster 3.2 L6 (2006–2008)
          • BMW Z4 M Coupe 3.2 L6 (2006–2008)
          • BMW X3 3.0i 3.0 L6 (2006)
          • BMW 325i Base 2.5 L6 (2004–2005)
          • BMW 325xi Base 2.5 L6 (2004–2005)
          • BMW 330i Base 3.0 L6 (2004–2005)
          • BMW 330xi Base 3.0 L6 (2004–2005)
          • BMW X3 2.5i 2.5 L6 (2005)
          • BMW 530i Base 3.0 L6 (2001–2003)
          • BMW Z3 M Roadster 3.2 L6 (2001–2002)

          This may also fit other applications. Please use the vehicle selector tool to verify fitment.

          Why Shop at eEuroparts.com?

          • Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
          • Exclusive Kits That Fit™ - complete repair solutions with no guesswork
          • Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
          • Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
          • Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
          • Established Trust: Serving the European auto community since 2000.

          Frequently Asked Questions

          What does the Genuine BMW 12311713143 Accessory Drive Belt Idler Pulley Cap do?

          The Genuine BMW Accessory Drive Belt Idler Pulley Cap serves to protect the tensioner assembly, ensuring that the accessory drive belt maintains proper tension for efficient engine performance.

          How do I know if my Accessory Drive Belt Idler Pulley Cap needs replacement?

          Common signs that this part may need replacement include unusual noises from the engine, visible damage to the dust cap, or issues with belt tension leading to slipping or wear.

          Can I install the Genuine BMW 12311713143 myself?

          Yes, the installation of the Genuine BMW Accessory Drive Belt Idler Pulley Cap is straightforward for those with basic mechanical skills. However, ensure you follow the manufacturer's guidelines for best results.

          What are the symptoms of a faulty Accessory Drive Belt Idler Pulley Cap?

          Symptoms of a failing Accessory Drive Belt Idler Pulley Cap may include abnormal engine noises, belt slippage, or decreased engine performance. If you notice these issues, inspect the cap for any signs of wear.

          Why should I choose Genuine BMW for my Accessory Drive Belt Idler Pulley Cap needs?

          Genuine BMW parts are manufactured to the highest standards, ensuring perfect fit and function. Order Genuine BMW 12311713143 today for a factory-correct replacement that restores safety and performance.

          Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.

            • eEuroparts SKU
              948122
            • Weight
              1.008 lbs
            • Dimensions (L x W x H)
              2 x 2 x 2 in
            • Manufacturer Part #
              12311713143
          • Brand
            Genuine BMW
          • Manufacturer
            Genuine BMW
          • MPN
            12311713143
          • Part Type
            Accessory Drive Belt Idler Pulley Cap
          • OE Part Numbers
            12 31 1 713 143, 12311713143
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          1998BMWZ3M Roadster (3.2 L6 GAS)Notes: 3.2 LITER WATER PUMP & ALTERNATOR
          1998BMW528iBase (2.8 L6 GAS)Notes: 528I 1997-98 MECHANICAL TENSIONER, small, Notes: 528I 1997-98 HYDRAULIC TENSIONER, center
          2000BMWZ3Coupe (2.8 L6 GAS)Notes: 2.8 & 3.0 LITER 2.8 LITER 1999-00, mount bracket
          2000BMWZ3Roadster (2.8 L6 GAS)Notes: 2.8 & 3.0 LITER 2.8 LITER 1999-00, mount bracket
          2000BMWZ3Roadster (2.5 L6 GAS)Notes: 2.5 LITER 1996-00, M8x85
          2000BMWZ3M Coupe (3.2 L6 GAS)Notes: 3.2 LITER WATER PUMP & ALTERNATOR
          2000BMWZ3M Roadster (3.2 L6 GAS)Notes: 3.2 LITER WATER PUMP & ALTERNATOR
          2000BMW323iBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2000BMW528iBase (2.8 L6 GAS)Notes: 525I,528I & 530I 1999-03 HYDRAULIC TENSIONER, center
          2000BMW328iBase (2.8 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2002BMW325iBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2002BMWZ3M Coupe (3.2 L6 GAS)Notes: 3.2 LITER WATER PUMP & ALTERNATOR
          2002BMWZ3M Roadster (3.2 L6 GAS)Notes: 3.2 LITER WATER PUMP & ALTERNATOR
          2002BMW325xiBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2002BMW530iBase (3.0 L6 GAS)Notes: 525I,528I & 530I 1999-03 HYDRAULIC TENSIONER, center
          2002BMW330iBase (3.0 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2002BMW330xiBase (3.0 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          1999BMW328iBase (2.8 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          1999BMW528iBase (2.8 L6 GAS)Notes: 525I,528I & 530I 1999-03 HYDRAULIC TENSIONER, center
          1999BMWZ3Roadster (2.5 L6 GAS)Notes: 2.5 LITER 1996-00, M8x85
          1999BMWZ3Coupe (2.8 L6 GAS)Notes: 2.8 & 3.0 LITER 2.8 LITER 1999-00, mount bracket
          1999BMWZ3Roadster (2.8 L6 GAS)Notes: 2.8 & 3.0 LITER 2.8 LITER 1999-00, mount bracket
          1999BMWZ3M Coupe (3.2 L6 GAS)Notes: 3.2 LITER WATER PUMP & ALTERNATOR
          1999BMWZ3M Roadster (3.2 L6 GAS)Notes: 3.2 LITER WATER PUMP & ALTERNATOR
          1999BMW323iBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          1997BMW528iBase (2.8 L6 GAS)Notes: 528I 1997-98 MECHANICAL TENSIONER, small, Notes: 528I 1997-98 HYDRAULIC TENSIONER, center
          2005BMW325xiBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2005BMW330xiBase (3.0 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2005BMWX32.5i (2.5 L6 GAS)Notes: 2004-06, center
          2005BMWX33.0i (3.0 L6 GAS)Notes: 2004-06, center
          2005BMW325iBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2005BMW330iBase (3.0 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2004BMW325xiBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2004BMW330xiBase (3.0 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2004BMWX32.5i (2.5 L6 GAS)Notes: 2004-06, center
          2004BMWX33.0i (3.0 L6 GAS)Notes: 2004-06, center
          2004BMW325iBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2004BMW330iBase (3.0 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2001BMW325xiBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2001BMW330xiBase (3.0 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2001BMW530iBase (3.0 L6 GAS)Notes: 525I,528I & 530I 1999-03 HYDRAULIC TENSIONER, center
          2001BMW325iBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2001BMWZ3M Coupe (3.2 L6 GAS)Notes: 3.2 LITER WATER PUMP & ALTERNATOR
          2001BMWZ3M Roadster (3.2 L6 GAS)Notes: 3.2 LITER WATER PUMP & ALTERNATOR
          2001BMW330iBase (3.0 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2006BMWX33.0i (3.0 L6 GAS)Notes: 2004-06, center
          2006BMWZ4M Coupe (3.2 L6 GAS)Notes: 3.2 LITER DRIVE BELT
          2006BMWZ4M Roadster (3.2 L6 GAS)Notes: 3.2 LITER DRIVE BELT
          2003BMW325iBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2003BMW325xiBase (2.5 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2003BMW530iBase (3.0 L6 GAS)Notes: 525I,528I & 530I 1999-03 HYDRAULIC TENSIONER, center
          2003BMW330iBase (3.0 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2003BMW330xiBase (3.0 L6 GAS)Notes: HYDRAULIC TENSIONER, center
          2007BMWZ4M Coupe (3.2 L6 GAS)Notes: 3.2 LITER DRIVE BELT
          2007BMWZ4M Roadster (3.2 L6 GAS)Notes: 3.2 LITER DRIVE BELT
          2008BMWZ4M Coupe (3.2 L6 GAS)Notes: 3.2 LITER DRIVE BELT
          2008BMWZ4M Roadster (3.2 L6 GAS)Notes: 3.2 LITER DRIVE BELT
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          Warranty Overview

          At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.

          Standard Warranty – Most Parts

          • Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.

          • Protection: Defects in materials or workmanship under normal personal use.

          • Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.

          • Exclusions:

            • Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)

            • Commercial, fleet, rideshare, off-road, or racing use

            • Improper installation, misuse, accidents, or modifications

          • Not Covered: Labor, shipping, towing, or incidental costs.

          Bison Performance Warranty – Our House Brand

          • Coverage: Limited Lifetime Warranty for as long as you own your vehicle.

          • Applies To: All products sold under the Bison Performance label.

          • Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.

          • Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).

          • What’s Included: Replacement of the defective product (labor and shipping excluded).

          Warranty Claim Requirements

          To keep claims fast and fair, we require:

          • Proof of purchase (invoice or order confirmation).

          • Photos or videos showing the defective part, order number, date, VIN, and odometer reading.

          • Diagnostic reports or part returns for non-visible issues may be requested.

          • Claims must be truthful, properly documented, and reflect normal consumer use.

          Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.

          For full details and exclusions, please see our complete Warranty Terms & Conditions.

          This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.

          Return Policy Overview

          Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
          To start a return, contact customer support via Chat or Contact Us.

          • Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)

          • Refunds: Issued to your original payment method within 3–5 business days after inspection

          • Exchanges: Not automatic — please return and reorder

          • Replacements: May be approved for incorrect or defective items reported within 7 days

          Not returnable:

          • Used or installed parts

          • Electrical components

          • Opened filter kits, gaskets, or contaminated items

          • Final sale or custom orders

          Important Notes:

          • Return shipping is your responsibility unless we made a verified error

          • Fitment is the customer’s responsibility (we can assist, but do not guarantee)

          • Country of origin may vary and is not grounds for return

          For complete details, please see our full Return Policy.


          This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.

          Fast, Reliable Shipping — Straight to Your Door

          We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.

          • We use trusted carriers like UPS, FedEx, and USPS.

          • Tracking info is emailed to you as soon as your order ships.

          • Delivery estimates at checkout are based on carrier data, but not guaranteed.

          Need help with a shipment?

          If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.

          For complete details, please see our full Shipping Policy.


          This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.

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