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          AISIN WPT-203 - Engine Water Pump

          MPN: WPT-203
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $68.61
          In stock

          Product Overview

          The AISIN WPT-203 Engine Water Pump is designed to provide optimal cooling performance for your vehicle's engine. As a critical component of the cooling system, it helps maintain the ideal temperature, ensuring your engine operates efficiently. With OE-level quality and reliability, this water pump guarantees a perfect fit for specific Lexus models, making it a trusted choice for automotive enthusiasts and professionals alike. Choose AISIN WPT-203 for dependable performance and peace of mind every time you service your vehicle.

          Cross Reference Numbers

          This AISIN WPT-203 is equivalent to or replaces the following part numbers: 16100-39595, 1610039595, WPT203, 170-3030, 1703030, 1600-583890, 1600583890, WP993, 1600-583892, 1600583892.

          Vehicle Compatibility

          • Lexus (2015-2017) NX200t 2.0
          • Lexus (2016-2017) GS200t 2.0
          • Lexus (2016-2017) IS200t 2.0
          • Lexus (2016-2017) RC200t 2.0
          • Lexus (2018-2019) GS300 2.0
          • Lexus (2018-2021) NX300 2.0
          • Lexus (2018-2022) IS300 2.0
          • Lexus (2018-2022) RC300 2.0

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

          Why Choose Newparts.com?

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

          What are the symptoms of a failing engine water pump?

          Common symptoms of a failing engine water pump include overheating, coolant leaks, and unusual noises from the engine. If you experience any of these issues, consider replacing it with AISIN WPT-203.

          How do I know if the AISIN WPT-203 is compatible with my vehicle?

          To ensure compatibility, check the vehicle compatibility section or use the vehicle selector tool. The AISIN WPT-203 is designed for specific Lexus models for a precise fit.

          What DTC codes might indicate a problem with the water pump?

          While water pumps do not directly trigger diagnostic trouble codes (DTCs), overheating issues may lead to codes like P0128, P0217, and P0300 due to engine performance problems. If you encounter these codes, inspect the AISIN WPT-203 for proper functionality.

          How often should I replace my engine water pump?

          It's recommended to replace your engine water pump every 60,000 to 100,000 miles, or whenever you notice signs of wear. The AISIN WPT-203 offers a reliable replacement to keep your engine running smoothly.

          Why should I purchase the AISIN WPT-203?

          Order AISIN WPT-203 today for a factory-correct replacement that restores safety and performance.

            • Newparts SKU
              204675
            • Weight
              2.4 lbs
            • Barcode
              4954514962056
            • Dimensions (L x W x H)
              8 x 6 x 5.7 in
            • Manufacturer Part #
              WPT-203
          • Brand
            AISIN
          • Manufacturer
            AISIN
          • MPN
            WPT-203
          • OE Part Numbers
            16100-39595, 1610039595
          • Cross Reference Numbers
            WPT203, 170-3030, 1703030, WPT-203, 1600-583890, 1600583890, WP993, 1600-583892, 1600583892
          • Part Type
            Engine Water Pump
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          2015LexusNX200tBase (2.0 L4 GAS)
          2015LexusNX200tF Sport (2.0 L4 GAS)
          2016LexusNX200tBase (2.0 L4 GAS)
          2016LexusNX200tF Sport (2.0 L4 GAS)
          2016LexusIS200tBase (2.0 L4 GAS)
          2016LexusIS200tF Sport (2.0 L4 GAS)
          2016LexusGS200tBase (2.0 L4 GAS)
          2016LexusGS200tF Sport (2.0 L4 GAS)
          2016LexusRC200tBase (2.0 L4 GAS)
          2016LexusRC200tF Sport (2.0 L4 GAS)
          2017LexusNX200tBase (2.0 L4 GAS)
          2017LexusNX200tF Sport (2.0 L4 GAS)
          2017LexusRC200tBase (2.0 L4 GAS)
          2017LexusRC200tF Sport (2.0 L4 GAS)
          2017LexusGS200tBase (2.0 L4 GAS)
          2017LexusGS200tF Sport (2.0 L4 GAS)
          2017LexusIS200tBase (2.0 L4 GAS)
          2017LexusIS200tF Sport (2.0 L4 GAS)
          2018LexusIS300Base (2.0 L4 GAS)
          2018LexusIS300F Sport (2.0 L4 GAS)
          2018LexusRC300Base (2.0 L4 GAS)
          2018LexusRC300F Sport (2.0 L4 GAS)
          2018LexusGS300Base (2.0 L4 GAS)
          2018LexusGS300F Sport (2.0 L4 GAS)
          2018LexusNX300Base (2.0 L4 GAS)
          2018LexusNX300F Sport (2.0 L4 GAS)
          2019LexusNX300Base (2.0 L4 GAS)
          2019LexusNX300F Sport (2.0 L4 GAS)
          2019LexusRC300Base (2.0 L4 GAS)
          2019LexusRC300F Sport (2.0 L4 GAS)
          2019LexusGS300Base (2.0 L4 GAS)
          2019LexusGS300F Sport (2.0 L4 GAS)
          2019LexusIS300Base (2.0 L4 GAS)
          2019LexusIS300F Sport (2.0 L4 GAS)
          2020LexusNX300Base (2.0 L4 GAS)
          2020LexusNX300F Sport (2.0 L4 GAS)
          2020LexusNX300Luxury (2.0 L4 GAS)
          2020LexusRC300Base (2.0 L4 GAS)
          2020LexusRC300F Sport (2.0 L4 GAS)
          2020LexusIS300Base (2.0 L4 GAS)
          2020LexusIS300F Sport (2.0 L4 GAS)
          2021LexusIS300Base (2.0 L4 GAS)
          2021LexusRC300Base (2.0 L4 GAS)
          2021LexusRC300F Sport (2.0 L4 GAS)
          2021LexusNX300Base (2.0 L4 GAS)
          2021LexusNX300F Sport (2.0 L4 GAS)
          2021LexusNX300Luxury (2.0 L4 GAS)
          2022LexusIS300Base (2.0 L4 GAS)
          2022LexusRC300Base (2.0 L4 GAS)
          2022LexusRC300F Sport (2.0 L4 GAS)
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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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