The 161A0-39035 water pump is an electric coolant pump listed by RunningRoo for selected 1.8-litre Toyota hybrid applications. The current description identifies the 2016–2021 Prius, 2017–2021 Prius Prime and 2020–2021 Corolla.
Because hybrid vehicles can contain more than one coolant circuit and more than one electrically driven pump, the OE number is the most important purchase filter. Do not order from the words “Toyota hybrid water pump” alone. Confirm that the failed pump is in the correct circuit and that the number on the original part cross-references to 161A0-39035.
View the verified product: RunningRoo 161A0-39035 electric water pump. Send the VIN, rego and original part number before checkout.
Fitment stated in the current product description
| Vehicle | Listed years | Engine size |
|---|---|---|
| Toyota Prius | 2016–2021 | 1.8L |
| Toyota Prius Prime | 2017–2021 | 1.8L |
| Toyota Corolla | 2020–2021 | 1.8L |
The product title on the website contains broader model wording, but the detailed description gives the three applications above. Use the detailed fitment and exact OE number as the basis for checking. A Camry, Lexus or another Toyota hybrid should not be added to the application simply because it appears in a broad title or compatibility search.
This is exactly the kind of order where a VIN check prevents a return.
Engine coolant pump or inverter coolant pump?
Hybrid cooling systems can include separate circuits for the internal-combustion engine and high-voltage power electronics. A pump from one circuit may be described casually as a “hybrid water pump”, but that does not make it interchangeable with a pump in the other circuit.
Before buying, ask the workshop to identify:
- which coolant circuit has the flow or performance problem;
- the location and connector of the failed pump;
- the complete number moulded or printed on the original part;
- whether the diagnosis points to the pump, its power supply, wiring or a cooling-system restriction; and
- the correct bleeding procedure for that specific circuit.
RunningRoo lists 161A0-39035 as a direct-replacement electric water pump. Matching that number is stronger evidence than matching the shape in a small online photo.
Signs that require cooling-system diagnosis
Possible complaints can include an engine-temperature warning, reduced coolant circulation, an electric-pump performance fault, overheating under particular conditions or a pump that does not operate when commanded.
Those symptoms do not prove that the pump motor has failed. Diagnosis should consider:
- coolant level and evidence of external leakage;
- stored fault codes and freeze-frame information;
- pump command and actual operation using suitable diagnostic equipment;
- power supply, ground, connector and wiring condition;
- restrictions, trapped air or contamination in the relevant circuit;
- thermostat, temperature-sensor and radiator performance where applicable; and
- whether a previous repair used the correct coolant and bleeding method.
Replacing an electric pump without correcting an air lock, wiring fault or cooling-system restriction can leave the warning active and the vehicle at risk.
Pre-order checklist for 161A0-39035
| Check | What to provide |
|---|---|
| Exact OE number | Clear photo showing 161A0-39035 or an approved cross-reference |
| Vehicle identity | Full 17-character VIN, model, build date and Australian rego |
| Powertrain | Confirm the listed 1.8L hybrid application |
| Pump circuit | Workshop identification of the engine-coolant versus power-electronics circuit |
| Physical match | Connector, mounting points, housing and hose-port orientation |
| Diagnosis | Scan report and electrical/cooling-system test result |
If one of these details is missing, pause before checkout. The time spent confirming a connector or OE number is far less than the time spent draining the system twice.
What is included?
The product page lists one new direct-replacement electric water pump with manufacturer part number/OE reference 161A0-39035. It does not state that coolant, hoses, clamps, seals beyond those supplied on the pump, or diagnostic/bleeding tools are included.
Inspect the delivered part before removing the original. Compare the mounting ears, coolant ports, electrical connector and identifying marks. If anything differs, contact RunningRoo before installation.
Installation and hybrid safety
Cooling-system work must follow the current Toyota procedure for the VIN. The technician needs to control hot coolant and system pressure, use the correct coolant, prevent contamination and bleed the correct circuit completely.
Hybrid vehicles also contain high-voltage components. Replacing a low-voltage electric coolant pump does not authorise untrained work near the high-voltage system. A suitably qualified technician should identify the circuit and observe the manufacturer’s isolation and safety requirements wherever the repair area or procedure demands it.
A robust installation plan includes:
- confirming the vehicle is cold and safely prepared;
- protecting electrical connectors from coolant;
- checking hoses and sealing surfaces;
- fitting the pump in the correct orientation;
- refilling with the specified coolant;
- running the applicable bleed or pump-control procedure;
- verifying flow, temperature behaviour and leak-free operation; and
- clearing and rechecking fault codes after a controlled road test.
Do not judge success only by the absence of a visible leak. Electric-pump command, circulation and temperature behaviour should also be verified.
Why an exact-part article converts better
A generic water-pump guide attracts readers who may own any vehicle. A search for 161A0-39035 usually comes from a buyer or workshop already holding a diagnostic report, an old pump or a parts quote. That makes accurate fitment information more valuable than broad sales language.
RunningRoo is based in Melbourne, stocks the pump locally and offers Australia-wide dispatch plus free local pickup by appointment. The business also invites buyers to provide the VIN and rego for confirmation—an important service because the broad website title and the detailed fitment list are not identical.
Check current stock and confirm the OE number: 161A0-39035 Toyota hybrid electric water pump.
Frequently asked questions
What cars are listed for 161A0-39035?
The current detailed description lists the 2016–2021 Toyota Prius 1.8L, 2017–2021 Prius Prime 1.8L and 2020–2021 Corolla 1.8L.
Does it fit a Toyota Camry or Lexus hybrid?
Do not assume so from the broad product title. The detailed fitment provided on the page does not list a Camry or Lexus model. Send the VIN and original OE number to RunningRoo for confirmation.
Is this the inverter coolant pump?
The listing calls it an electric water pump, but the vehicle may have multiple cooling circuits. Identify the failed pump and match OE number 161A0-39035 rather than relying on a generic circuit name.
Can a warning code prove the pump is faulty?
Not by itself. The workshop should test pump operation, power, ground, wiring, coolant level and circuit condition.
Does the cooling system need to be bled after replacement?
Yes. Follow the vehicle-specific Toyota procedure for filling and bleeding the relevant circuit, then verify flow and temperature behaviour.
What should I send RunningRoo?
Provide the full VIN, rego, model/build information, a clear photo of the original pump and its OE number, and the workshop’s identification of the coolant circuit.
Source and fitment basis
*Fitment information is a guide. Always verify the VIN, original OE number, coolant circuit and current manufacturer service information before installation.*
Professional verification before the vehicle is opened
A parts page is most useful when it helps the customer and workshop make the same decision from the same evidence. For a Toyota 161A0-39035 hybrid electric water pump enquiry, begin with VIN, hybrid-system diagnosis, original OE number and workshop test results. Put those details in the first message rather than supplying a vehicle model alone. This gives the seller a real basis to compare the order with the current product description, and gives the installer a record it can use before work begins.
The evidence must be read as a group. A VIN may identify original build data, but it does not prove that an older vehicle has never had an engine, transmission or timing-system repair. An original number is valuable, but can be superseded. A scan result may direct the technician towards a system, but it is not a part-number instruction. The safe purchase decision is the one where the vehicle record, physical component information, workshop scope and live listing agree. If one of those sources conflicts, pause the order and resolve the difference first.
A workshop-to-seller handover that prevents delays
Ask the workshop for a short, factual note. It does not need to contain its entire repair procedure. It should identify the vehicle, the exact system or component requested, the key number or position, and whether the repair scope is confirmed. Pair that note with clear, correctly oriented photographs of labels or removed parts where available. Avoid relying on a screenshot of a similar listing or a photo from a forum. A useful handover is evidence from the actual vehicle.
| Checkpoint | Evidence | What it prevents |
|---|---|---|
| Vehicle identity | Full VIN and build information | Ordering by badge or registration year alone |
| System identity | Engine or gearbox code and repair scope | Mixing related but different applications |
| Part identity | Complete original number, suffix and photos | Near-match or revision errors |
| Listing identity | Current product title, contents and conditions | Ordering from outdated saved information |
| Installation plan | Qualified workshop confirmation | A parcel arriving without a practical fitting plan |
This table is deliberately conservative. It does not make diagnosis slower; it moves the important questions to before payment and before the vehicle is dismantled. For regional and interstate customers, it is also an effective way to avoid a vehicle sitting at a workshop while an overlooked seal, consumable, code or fitment question is resolved.
Technical statements and official information
This article is a buying and planning guide, not a substitute for a repair manual. The technical principles discussed here—vehicle-specific identification, structured diagnosis, controlled installation and post-repair verification—must be applied using the current procedure for the exact vehicle. Toyota provides official technical-information access at Toyota technical information. The workshop performing the work must consult the applicable official information for torque values, safety steps, programming, fluid specification, timing alignment, component testing and any one-time-use hardware.
That boundary matters. An online retailer cannot see oil pressure, wiring integrity, mechanical timing, clutch condition, cooling-system performance or software state from a message. A qualified workshop can test the vehicle and select the correct procedure. RunningRoo can then help assess whether the identified component and the current listing are aligned. Keeping those roles separate improves repair quality and prevents an online purchase being treated as a remote diagnosis.
Before ordering: make the job scope visible
A common cause of repeat labour is treating the named product as every part required for a job. A timing kit, control unit, clutch pack or electric pump may be central to the repair, but a workshop can also require gaskets, fasteners, fluids, seals, filters, adaptation work or related inspection. The product contents should be compared with the work order, not assumed to be a complete workshop package. Ask the installer what it expects to supply, what it expects the customer to supply and what it will only decide after inspection.
Be equally precise about the repair boundary. An item can be compatible with the vehicle and still not be the correct answer to its present fault. A component may be required only after a pressure test, scan-data comparison, electrical test, mechanical inspection or disassembly finding. The correct question is therefore not “will this fix it?” but “has the workshop identified this exact item as part of the repair scope, and does the current listing match that identity?”
Receiving, inspection and evidence retention
When delivery arrives, photograph the shipping label and outer package before opening it. Compare the invoice, product title, included components and visible markings with the evidence sent to the seller and with the workshop’s note. Keep all packaging, product labels and the order record together until the intended installer has inspected the item.
If anything is inconsistent, do not force a comparison by opening, programming, connecting, modifying or trial-fitting the item. Preserve its condition, record the difference and contact the seller with the order number, VIN, original information and clear photographs. A concise statement such as “the original number has a different suffix; no installation attempted” is more useful than a general claim that the part looks different. It allows a question to be resolved before the evidence is compromised.
After the repair, retain the seller invoice with the workshop invoice, vehicle kilometres and a short description of the completed work. This record assists later servicing and a future owner. It does not guarantee a future repair outcome, but it gives the next technician facts rather than an incomplete description such as “a timing part” or “a DSG part” was replaced.
Fitment decision chart
| If this is known | Appropriate next step |
|---|---|
| VIN, system identity, original number and listing align | Confirm stock, delivery and workshop schedule |
| Vehicle identity is known but the repair scope is unclear | Complete diagnosis before purchasing |
| An original number or suffix differs | Request a fitment review with photos |
| The workshop has identified extra seals, fluid or hardware | Add those items to the job plan before booking |
| Delivery has arrived but evidence does not align | Stop before installation and retain packaging |
| The installer cannot perform required commissioning or verification | Arrange a suitably equipped workshop first |
Frequently asked questions
Can I order from the vehicle model name alone?
No. Use the VIN plus the exact engine or gearbox information, and compare the current listing with the component requested by the workshop.
Does a warning light or stored fault code prove this part is needed?
No. A code is evidence for diagnosis, not a replacement instruction. The workshop must confirm the cause and repair scope using the official procedure for the vehicle.
Why does the complete OE number matter?
A number can contain revisions or suffixes that matter to identification. Copy every visible character and provide a clear photograph where possible.
Does the product listing include every item needed for installation?
Do not assume so. Check the current listed contents and ask the installer about seals, fluids, fasteners, consumables, programming or related work.
What should I do if the delivered component looks different?
Stop before fitting, modifying, connecting or programming it. Retain packaging and contact the seller with the order details and evidence from the vehicle.
Can this article replace official workshop information?
No. The article supports a safer purchase decision. Official service information and a qualified technician are required for diagnosis, safety procedures, installation and final verification.
Official source and editorial note
The official technical-information portal for the vehicle family is Toyota technical information. It is cited for the requirement to use current, vehicle-specific repair procedures. RunningRoo is an independent parts seller and is not affiliated with or endorsed by Toyota. Product availability, applications and contents can change, so re-check the live product page and provide the fitment evidence before ordering.