Credov's researched list of the 5 faults the Toyota Aqua GR Sport is known for (2011–2021), 4 of them serious or costly. Each one says what to look for when you check the car, so you can spot it before you buy. Not every car has these faults: they are the ones worth checking on this model.
What to look for: Switch to READY and listen at the driver's footwell and under the bonnet on the driver's side.
Why it matters: Toyota USA ran a customer support programme for internal malfunctions of the brake booster and booster pump on Prius c built mid-July 2011 to early December 2014 (2012-2014 model years, same car as early Aqua), with codes C1391, C1252, C1256 or C1253.
What to look for: On the test drive watch the battery gauge.
Why it matters: Japanese and NZ sources put typical life at 10-12 years or 150,000-220,000 km for private cars, with first signs from about 100,000-150,000 km; cases at 120,000 km and 180,000 km are common in Japanese workshop logs, and some packs pass 280,000 km.
What to look for: Look at the water pump area at the front of the engine for pink or white crusty coolant residue and check.
Why it matters: Japanese owner logs show failures at about 187,000 km and 200,000 km with the engine check light, and many owners change it pre-emptively around 200,000 km. The pump sits at the top front of the engine and is about a 1-2 hour job; the updated Toyota/Aisin part comes with an improved seal. Coolant must be bled properly afterwards. Left unrepaired this grows into a major repair bill.
What to look for: The inverter pump should give a faint, even hum; a loud drone, grinding, or no sound at all is suspect.
Why it matters: A Japanese owner at 170,000 km had exactly this and paid about 34,000 yen for the pump; another owner at 200,000 km replaced a pump that hummed constantly. Air left in the inverter loop after coolant work can also set codes, so bleeding matters. Left unrepaired this grows into a major repair bill.
What to look for: Look at both headlight lenses for yellowing, clouding, crazing or a patchy recent polish job.
Why it matters: Polishing alone wears off again within months; a proper fix is polishing plus a new urethane clear coat, or new headlight units, and yellowed lenses also reduce how much light reaches the road at night.
Got a question about a Toyota Aqua GR Sport? Ask Credov: a noise, a warning light, a part or how to fix it.
On top of the faults above, every Credov inspection covers the basics: fuel smell, leaks or filler rust, engine oil leaks, power steering fluid leak, drive belt cracks or squeal, rust underneath: chassis and mounts, engine mounts, engine oil level and colour, coolant level, colour and leaks, head gasket failure signs, cold start: rattle, knock or smoke, rough or hunting idle, engine running hot on gauge, gearbox or diff oil leak, swapped gearbox without lvv and more.
Researched by Credov from manufacturer recalls and service bulletins, owner reports and workshop sources. Repair prices are typical ranges, not quotes. See also fault codes and repair costs.