Toyota Aqua NHP10 Parts Guide: What to Replace and Where to Find It

This guide contains affiliate links to eBay. See the note at the end.

Quick answer: The NHP10 Aqua is the same basic car as the Prius c sold new in Australia and New Zealand, with the same 1NZ-FXE hybrid engine, so search "Prius c" as well as "Aqua" and "NHP10" for service parts. On a newly landed Aqua, check the hybrid battery cooling fan intake (vacuum it, don't blow it) and the 12V auxiliary battery first.

Parts in this guide, with live eBay listings

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The NHP10 Toyota Aqua is easier to find parts for than most Japanese imports, because the same car was sold new in Australia and New Zealand as the Prius c. This guide shows you which parts cross over, the two hybrid jobs every newly landed Aqua needs checked, and the service parts you'll buy most.

It's written for owners in New Zealand, Australia and the UK, where the Aqua is a common sight as a used import. If you've ever wondered what's humming quietly under the back seat, you're about to find out.

The Aqua, the Prius c and the Yaris Hybrid

The NHP10 Aqua and the Prius c are the same basic car, and both use the 1NZ-FXE 1.5 L petrol-hybrid engine. Toyota sold the Prius c new in Australia and New Zealand from April 2012, and in North America too.

In the UK and Europe the Prius c was never sold. Instead, Toyota offered the Yaris Hybrid (2012–2020), which uses the same hybrid powertrain. The body is different, but it can be a useful cross-reference for engine service parts.

That means:

  • Many engine service parts (oil filter, air filter, spark plugs) are often the same as, or have an equivalent in, a locally sold model.
  • Local Toyota dealers and parts stores may be able to supply parts if you ask for the Prius c (or, in the UK, the Yaris Hybrid) equivalent.
  • When you search online, try "Prius c" as well as "Aqua" and "NHP10". It widens your results a lot.

The catch: Japanese-market Aquas came in many grades over a 2011–2021 run, with facelifts in late 2014 and mid-2017. Some exterior, interior and electrical parts differ from the Prius c. For anything beyond basic service parts, confirm with your frame number (it starts with NHP10-).

Not sure where to find it? See how to read a Japanese model code, or paste your code into our free Model Code Lookup to confirm the engine and jump to the matching parts pages.

1. The hybrid battery cooling fan

This is the Aqua part most owners have never heard of, and one of the most important.

The hybrid battery sits under the rear seat and is cooled by a small fan that draws air from the cabin through an intake vent. Over time the intake and fan collect dust, pet hair and lint. When airflow drops, the battery runs hotter, and Toyota warns that a blocked intake can lead to the hybrid system limiting battery output, which costs you fuel economy.

  • Check the intake vent near the rear seat regularly. Your owner's manual shows where it is. If you can see fluff on it, the fan behind it is probably dirty too.
  • Vacuum it, don't blow it. Toyota's own hybrid manuals say to clean the intake with a vacuum cleaner and not to use compressed air, which pushes dust further in. Don't wipe it with water either.
  • Cleaning the fan itself means removing trim. Many owners do it themselves, but if you're not comfortable working near the hybrid battery, have a mechanic do it.

→ Aqua NHP10 hybrid battery cooling fans and filters

Warning signs: a fan that's louder than usual, a hybrid warning light or message, or a car that suddenly uses more fuel. Get it checked rather than ignoring it.

2. The 12V auxiliary battery

The Aqua has two batteries: the big hybrid battery and a small 12V battery that powers the car's electronics. If the 12V battery is weak, the car may refuse to go into "Ready" mode, even though the hybrid battery is fine.

Imported cars can sit at port and in compliance for weeks, so a tired 12V battery is a common find on a newly landed Aqua.

  • Hybrid auxiliary batteries can be a specific type. Match the part number or the Japanese size code on your current battery, not just the physical size. Our model code guide explains how to read JIS battery codes.
  • If you leave the car for long periods, a battery maintainer can help.

→ Aqua NHP10 12V auxiliary batteries

3. Service parts

These are the parts you'll buy at every service or every few services. Check your owner's manual or service book for the intervals that apply to your car.

4. Brakes and wipers

Regenerative braking means the pads often last a long time. But "a long time" isn't forever, and a car that has sat unused can have sticky calipers or rusty rotors, so have the brakes checked on a newly landed car.

5. The import-only extras

Most Japanese-market Aquas share the same few quirks:

More on the radio and head unit: fixing the radio, reverse camera and steering controls on a Japanese import.

Also own a Prius Alpha?

The Prius Alpha (ZVW40/41) is a different, larger car with a 1.8 L hybrid system, so don't assume its parts fit the Aqua. We list it separately: Prius Alpha ZVW40/41 parts. For the full rundown, see our Prius 30 and Prius Alpha parts guide.

Buying Aqua parts online: a quick checklist

  1. Search "NHP10", "Aqua" and "Prius c" separately. Sellers use all three.
  2. When a listing shows an OEM part number, search that number to compare prices.
  3. For anything beyond filters and plugs, send the seller your frame number before buying.
  4. Compare the landed cost, including shipping and GST (VAT in the UK), with a local quote.

See all Toyota Aqua Parts (NHP10) with live eBay prices →

FAQ

Is the Toyota Aqua the same as the Prius c?

The NHP10 Aqua and the Prius c are the same basic car, and both use the 1NZ-FXE 1.5 L petrol-hybrid engine. Japanese-market Aquas came in many grades with facelifts in late 2014 and mid-2017, so confirm anything beyond basic service parts with your frame number.

Do Yaris Hybrid parts fit a Toyota Aqua?

The Yaris Hybrid (2012–2020) sold in the UK and Europe uses the same hybrid powertrain, so it can be a useful cross-reference for engine service parts. The body is different, so don't assume body or trim parts match.

How do I clean the hybrid battery fan on an Aqua?

Vacuum the intake vent near the rear seat; Toyota's hybrid manuals say not to use compressed air, which pushes dust further in, and not to wipe it with water. Cleaning the fan itself means removing trim, so have a mechanic do it if you're not comfortable working near the hybrid battery.

Why won't my Aqua go into Ready mode?

A weak 12V auxiliary battery can stop the car going into "Ready" mode even when the hybrid battery is fine. It's a common find on newly landed Aquas that sat at port and in compliance for weeks.

Do Prius Alpha parts fit the Aqua?

Don't assume so. The Prius Alpha (ZVW40/41) is a different, larger car with a 1.8 L hybrid system.

Find every Aqua part we list, plus the other popular imports, in Grey Import Family Cars. Each page searches eBay in Australia, the US, the UK and Germany, and you sort the results however you like.

Ad / Affiliate links: YOU SHOULD, SHA. Parts links to eBay. We earn a commission from eBay on qualifying purchases made through those links, at no extra cost to you. We are not eBay and not the seller. Always confirm fitment with the seller or a qualified mechanic.