Replacement and Cross-Reference Numbers
This water pump is commonly cross-referenced with:
- WPT-190
- AW6682
- 170-4030
- 131-2494
- 41500E
- Toyota/Lexus 161A0-29015
- Toyota/Lexus 161A0-39015
Cross-reference numbers identify possible equivalent applications, but they do not replace vehicle-specific verification. Compare the OE number, connector, housing and mounting holes with the pump removed from your vehicle.
Designed for Hybrid Engine Cooling
This electric pump maintains coolant circulation through the gasoline engine’s cooling circuit. Proper flow helps control cylinder-head and engine-block temperatures during changing hybrid operating conditions.
The pump features a cast housing, an electrically driven impeller and seals intended for continuous exposure to engine coolant and repeated thermal cycling. Its five-hole mounting configuration is designed as a direct replacement on the applications listed above.
Common Signs of a Failing Prius Water Pump
Possible symptoms include:
- Engine overheating or an overheating warning
- Rapid temperature changes
- Weak or inconsistent engine-coolant circulation
- Coolant leakage around the pump housing
- Unusual pump noise
- Cooling-system diagnostic trouble codes
- A pump that fails to operate when commanded
An overheating condition does not automatically prove that the water pump has failed. A low coolant level, trapped air, restricted radiator, thermostat problem or electrical fault can produce similar symptoms. Our guide to bad thermostats versus bad water pumps can help narrow down the problem.
If coolant is disappearing, inspect the system using our guide on how to find a coolant leak.
Product Features
- Electric engine-coolant pump for select Toyota and Lexus hybrids
- Direct-replacement mounting configuration
- Cast pump housing
- Precision-balanced impeller
- High-temperature sealing components
- Designed to restore proper engine-coolant circulation
- Cross-references WPT-190, AW6682 and 170-4030
- Seller-stated one-year replacement warranty
The supplier states that the pump is manufactured in ISO 9001 and IATF 16949-certified facilities and tested for leakage, pressure, balance and dimensional accuracy. These certifications cover quality-management processes; they do not independently establish that a component is identical to a Toyota or Lexus OE pump.
Installation Notes
Drain the engine-cooling circuit before removing the old pump. Clean the mounting surface, install the correct seal, reconnect the electrical connector and refill the system with coolant approved for the vehicle.
Air must be removed from the system after installation. Trapped air can cause poor circulation and overheating even when the new pump works correctly. See our guide on flushing and refilling a cooling system and review the differences between automotive coolant types.
Although this is an engine-cooling component, it is installed in a hybrid vehicle. Follow the factory service procedure and observe all hybrid-system safety precautions. Do not handle orange high-voltage components unless properly trained.
Frequently Asked Questions
Does this pump cool the hybrid inverter?
No. This is the electric engine water pump. The inverter uses a separate cooling circuit and inverter coolant pump.
Does it fit a 2019 Toyota Prius?
It may fit a 2019 Prius c, subject to OE-number verification. It should not be advertised as fitting every 2019 Prius model. The standard fourth-generation Prius uses different applications.
Does the Prius c have a 1.8L engine?
No. The Prius c listed here uses the 1.5L 1NZ-FXE hybrid engine. The Prius, Prius Plug-in, Prius v and Lexus CT 200h applications use the 1.8L 2ZR-FXE.
Is this a belt-driven pump?
No. It is an electrically driven engine coolant pump.
Will replacing the pump fix an overheating Prius?
It can correct overheating caused by a failed engine water pump. It will not repair overheating caused by low coolant, air in the system, a blockage, thermostat trouble, radiator failure or another electrical problem.
Are AW6682, WPT-190 and 170-4030 the same application?
They are commonly listed as cross-references. Catalog coverage can differ slightly, particularly for the Prius c, so confirm the Toyota/Lexus OE number and physical configuration.
Fitment Verification
Before ordering, confirm:
- The complete year, make and model.
- Whether the vehicle is a Prius, Prius c, Prius v or Prius Plug-in.
- The correct engine displacement.
- OE number 161A0-29015 or 161A0-39015 where applicable.
- The electrical connector and five-hole mounting pattern.
Application references: AISIN WPT-190 installation information, Lexus OE 161A0-29015 catalog and Airtex AW6682 application listing.
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