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          URO Parts URO-001604 - Engine Coolant Reservoir Cap

          MPN: URO-001604
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $2.40
          In stock

          Product Overview

          The URO Parts URO-001604 Engine Coolant Reservoir Cap is designed to maintain the optimal pressure and prevent coolant loss in your vehicle's cooling system. This cap is engineered to meet OE-level quality and reliability, ensuring a perfect fit for various Audi and Volkswagen models. With the trusted URO Parts brand, you can be confident in the performance and durability of this essential component. Choose URO Parts URO-001604 for dependable performance and peace of mind every time you service your vehicle.

          Cross Reference Numbers

          This URO Parts URO-001604 is equivalent to or replaces the following part numbers: URO001604, 118 54022 589, 11854022589, 118 54022 738, 11854022738, 1J0121321B, 603-027, 603027, 118 54022 280, 11854022280, 1J0 121 321B-E, 1J0121321BE, CPE0024P, 31529, 955 106 447 20, 95510644720, V10-0209, V100209, 14700, 1J0 121 321A, 1J0121321A, 1J0121321BMY, 10249, 1J0 121 321, 1J0121321, 1J0 121 321B, GAT 31529, GAT31529, 118 54022 500, 11854022500.

          Vehicle Compatibility

          • Audi A4 (1996-2001) 2.8 V6
          • Audi A4 Quattro (1996-2001) 2.8 V6
          • Audi A4 (1997-2001) 1.8
          • Audi A4 Quattro (1997-2001) 1.8
          • Audi A6 (1998-2001) 2.8 V6
          • Audi A6 Quattro (1998-2001) 2.8 V6
          • Audi A6 Quattro (2000-2001) 2.7 V6
          • Audi S4 (2000-2002) 2.7 V6
          • Audi TT (2000-2002) 1.8
          • Audi TT Quattro (2000-2002) 1.8

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

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          • Trusted by DIYers and pros for over 15 years
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          Frequently Asked Questions

          What is the function of the URO Parts URO-001604?

          The URO Parts URO-001604 serves to seal the coolant reservoir, preventing coolant from escaping and maintaining the necessary pressure within the cooling system.

          How do I know if the URO-001604 is compatible with my vehicle?

          Always check the vehicle compatibility section above to ensure that the URO Parts URO-001604 fits your specific make and model. You can also use the part number for verification.

          What should I do if I see a DTC related to the cooling system?

          If you encounter diagnostic trouble codes (DTCs) like P0117 or P0118, it may indicate issues with temperature sensors, which could affect the coolant system's performance. Inspect the URO Parts URO-001604 cap to ensure it is functioning correctly.

          How often should I replace my coolant reservoir cap?

          It is recommended to replace the coolant reservoir cap if you notice any signs of wear, leaks, or if it is not sealing properly. Regular checks can help maintain your vehicle's cooling efficiency.

          Is the URO-001604 easy to install?

          Yes, the URO Parts URO-001604 is designed for easy installation; simply remove the old cap and replace it with the new one for an effective seal.

          Order URO Parts URO-001604 today for a factory-correct replacement that restores safety and performance.

            • Newparts SKU
              4301025
            • Weight
              0.15 lbs
            • Dimensions (L x W x H)
              6 x 4 x 1.05 in
            • Manufacturer Part #
              URO-001604
          • Brand
            URO Parts
          • Manufacturer
            URO Parts
          • MPN
            URO-001604
          • Features
            California Proposition 65 : WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
          • Cross Reference Numbers
            URO001604, 118 54022 589, 11854022589, 118 54022 738, 11854022738, 1J0121321B, 603-027, 603027, 118 54022 280, 11854022280, 1J0 121 321B-E, 1J0121321BE, CPE0024P, 31529, 955 106 447 20, 95510644720, V10-0209, V100209, 14700, 1J0 121 321A, 1J0121321A, 1J0121321BMY, 10249, 1J0 121 321, 1J0121321, 1J0 121 321B, GAT 31529, GAT31529, 118 54022 500, 11854022500
          • Part Type
            Engine Coolant Reservoir Cap
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          2005VolkswagenTouaregBase (3.2 V6 GAS)
          2005VolkswagenTouaregBase (4.2 V8 GAS)
          2005VolkswagenGolfGL (2.0 L4 GAS)
          2005VolkswagenGolfGLS (2.0 L4 GAS)
          2005VolkswagenGolfGTI 1.8T (1.8 L4 GAS)
          2005VolkswagenGolfGTI VR6 (2.8 V6 GAS)
          2005VolkswagenGolfTDI (1.9 L4 DIESEL)
          2004VolkswagenTouaregV6 (3.2 V6 GAS)Notes: w/ Handle for cap removal
          2004VolkswagenTouaregV8 (4.2 V8 GAS)Notes: w/ Handle for cap removal
          2004VolkswagenGolfGL (2.0 L4 GAS)
          2004VolkswagenGolfGL TDI (1.9 L4 DIESEL)
          2004VolkswagenGolfGLS (2.0 L4 GAS)
          2004VolkswagenGolfGLS TDI (1.9 L4 DIESEL)
          2004VolkswagenGolfGTI 1.8T (1.8 L4 GAS)
          2004VolkswagenGolfGTI VR6 (2.8 V6 GAS)
          2006VolkswagenTouaregBase (4.2 V8 GAS)
          2006VolkswagenTouaregBase (3.2 V6 GAS)
          2006VolkswagenGolfGL (2.0 L4 GAS)
          2006VolkswagenGolfGLS (2.0 L4 GAS)
          2006VolkswagenGolfGLS TDI (1.9 L4 DIESEL)
          2006VolkswagenGolfGTI 1.8T (1.8 L4 GAS)
          2006AudiA3 QuattroBase (3.2 V6 GAS)
          2006AudiA3Base (2.0 L4 GAS)
          2007VolkswagenTouaregBase (4.2 V8 GAS)
          2007VolkswagenTouaregBase (3.6 V6 GAS)
          2007AudiA3 QuattroBase (3.2 V6 GAS)
          2007AudiA3Base (2.0 L4 GAS)
          2000VolkswagenGolfGL (1.9 L4 DIESEL)
          2000VolkswagenGolfGL (2.0 L4 GAS)
          2000VolkswagenGolfGLS (1.8 L4 GAS)
          2000VolkswagenGolfGLS (1.9 L4 DIESEL)
          2000VolkswagenGolfGLS (2.0 L4 GAS)
          2000VolkswagenGolfGTI GLS (1.8 L4 GAS)
          2000VolkswagenGolfGTI GLS (2.0 L4 GAS)
          2000VolkswagenGolfGTI GLX (2.8 V6 GAS)
          2000VolkswagenPassatGLS (1.8 L4 GAS)
          2003VolkswagenGolfGL (1.9 L4 DIESEL)
          2003VolkswagenGolfGL (2.0 L4 GAS)
          2003VolkswagenGolfGLS (1.9 L4 DIESEL)
          2003VolkswagenGolfGLS (2.0 L4 GAS)
          2003VolkswagenGolfGTI 1.8T (1.8 L4 GAS)
          2003VolkswagenGolfGTI 20th Anniversary (1.8 L4 GAS)
          2003VolkswagenGolfGTI VR6 (2.8 V6 GAS)
          2001VolkswagenGolfGL (2.0 L4 GAS)
          2001VolkswagenGolfGL (1.9 L4 DIESEL)
          2001VolkswagenGolfGLS (1.9 L4 DIESEL)
          2001VolkswagenGolfGLS (1.8 L4 GAS)
          2001VolkswagenGolfGLS (2.0 L4 GAS)
          2001VolkswagenGolfGTI GLS (1.8 L4 GAS)
          2001VolkswagenGolfGTI GLX (2.8 V6 GAS)
          1999VolkswagenGolfGL (2.0 L4 GAS)Chassis: A4, Notes: w/ Handle for cap removal
          1999VolkswagenGolfGL (1.9 L4 DIESEL)Chassis: A4, Notes: w/ Handle for cap removal
          1999VolkswagenGolfGLS (2.0 L4 GAS)Chassis: A4, Notes: w/ Handle for cap removal
          1999VolkswagenGolfGTI (2.0 L4 GAS)Chassis: A4, Notes: w/ Handle for cap removal
          1999VolkswagenGolfGTI (2.8 V6 GAS)Chassis: A4, Notes: w/ Handle for cap removal
          1999VolkswagenGolfTDI (1.9 L4 DIESEL)Chassis: A4, Notes: w/ Handle for cap removal
          1999VolkswagenGolfWolfsburg Edition (2.0 L4 GAS)Chassis: A4, Notes: w/ Handle for cap removal
          1999VolkswagenPassatGLS (1.8 L4 GAS)
          1999VolkswagenPassatGLS (2.8 V6 GAS)
          1999VolkswagenPassatGLX (2.8 V6 GAS)
          2002VolkswagenGolfGL (2.0 L4 GAS)
          2002VolkswagenGolfGL (1.9 L4 DIESEL)
          2002VolkswagenGolfGLS (1.9 L4 DIESEL)
          2002VolkswagenGolfGLS (2.0 L4 GAS)
          2002VolkswagenGolfGTI 1.8T (1.8 L4 GAS)
          2002VolkswagenGolfGTI 337 (1.8 L4 GAS)
          2002VolkswagenGolfGTI VR6 (2.8 V6 GAS)
          2008VolkswagenTouaregBase (3.6 V6 GAS)
          2008AudiA3 QuattroBase (3.2 V6 GAS)
          2008AudiA3Base (2.0 L4 GAS)
          2009VolkswagenTouaregBase (3.6 V6 GAS)
          2009AudiA3 QuattroBase (3.2 V6 GAS)
          2009AudiA3 QuattroBase (2.0 L4 GAS)
          2009AudiA3Base (2.0 L4 GAS)
          2010VolkswagenTouaregVR6 (3.6 V6 GAS)
          2010AudiA3 QuattroBase (2.0 L4 GAS)
          2010AudiA3Base (2.0 L4 GAS)
          2010AudiA3TDI (2.0 L4 DIESEL)
          2011AudiA3 QuattroBase (2.0 L4 GAS)
          2011AudiA3Base (2.0 L4 GAS)
          2011AudiA3TDI (2.0 L4 DIESEL)
          2012AudiA3 QuattroBase (2.0 L4 GAS)
          2012AudiA3Base (2.0 L4 GAS)
          2012AudiA3TDI (2.0 L4 DIESEL)
          2013AudiA3 QuattroBase (2.0 L4 GAS)
          2013AudiA3Base (2.0 L4 GAS)
          2013AudiA3TDI (2.0 L4 DIESEL)
          1998AudiA6 QuattroAvant (2.8 V6 GAS)
          1998AudiA6 QuattroBase (2.8 V6 GAS)
          1998AudiA4Avant (2.8 V6 GAS)
          1998AudiA4Base (2.8 V6 GAS)
          1998AudiA4 QuattroBase (2.8 V6 GAS)
          1998AudiA4 QuattroAvant (2.8 V6 GAS)
          1998AudiA6Base (2.8 V6 GAS)
          1998VolkswagenPassatGLS (1.8 L4 GAS)
          1998VolkswagenPassatGLX (2.8 V6 GAS)
          1998VolkswagenPassatGLS (2.8 V6 GAS)
          1996AudiA4Base (2.8 V6 GAS)
          1996AudiA4 QuattroBase (2.8 V6 GAS)
          1997AudiA4Base (2.8 V6 GAS)
          There are more vehicles this part is compatible with. Check if it fits your vehicle.
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          Warranty Overview

          At Newparts, 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, use our Return Portal or contact support.

          • 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 full details, please see our complete 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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