KNOWN FAULTS · Toyota

Toyota iQ 1.0 / 1.33 VVT-i common problems.

2009–2015 · Petrol

Sources are not verified in real time and no entry confirms that your car is affected.

3 known faults with sources

Applies if: Toyota USA tech tip for all its models: it applies if the judder began after wheels, pads or discs were removed or changed.

Brake judder from wheel nuts over-tightened or tightened unevenly (Toyota tech tip)Brakes

Engine / equipment: Any Toyota: it depends on how the wheels are tightened
Period mentioned: 2016 tech tip for all its models
Symptoms: Vibration in the steering wheel and the pedal when braking, even gently and at any speed, often shortly after wheels, pads or discs were changed.
Possible cause described: Toyota points out in a tech tip that if the wheel nuts are over-tightened or tightened unevenly (a single one is enough), the brake disc is left with runout and brake judder appears. It happens above all when they are run fully home with an impact gun instead of a torque wrench in a star pattern.
Check for the garage: Ask the garage to loosen and re-tighten the nuts with a torque wrench, to the manual's torque and in a star pattern, and to measure whether the discs have been left warped; if so, they will need skimming or replacing.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Applies if: Only the 1.0 VVT-i three-cylinder (1KR-FE).

Water pump and clutch on the 1.0 VVT-i (1KR-FE)Cooling

Engine / equipment: 1.0 VVT-i three-cylinder (1KR-FE): Toyota Aygo, Yaris and iQ, Peugeot 107 and Citroën C1
Period mentioned: Approx. 2005–2011
Symptoms: Coolant loss with coloured residue next to the pump and rising temperature; a clutch that slips or squeals and hard gear changes earlier than normal.
Possible cause described: In the early years the water pump often failed after about three years of use; it was improved in 2009. The original 180 mm clutch was short-lived; a larger one was fitted from 2009 (a 190 mm alternative exists). The German Yaris II guide also lists faulty water pumps on the 1.0.
Check for the garage: Look for dried coolant residue under the pump and watch the level. Test the clutch pulling away on a hill; if it is replaced, ask for the improved version.
Cost cited in the source: Approx. €300–550 for the water pump (German used-car guide).A rough figure from the original database, not an up-to-date quote.

Applies if: Only the 1.33 Dual VVT-i (1NR-FE).

Oil consumption on the 1.33 Dual VVT-i (1NR-FE)Engine

Engine / equipment: 1.33 Dual VVT-i (1NR-FE): Yaris, iQ, Urban Cruiser, Auris and Verso-S
Period mentioned: Approx. 2008–2013
Symptoms: The oil level drops between services (more than half a litre per 1,000 km and up to a litre or more), usually from 150,000–200,000 km; bluish smoke.
Possible cause described: Owner forums blame low-friction piston rings that do not scrape the oil well; the fix was revised pistons and rings. The German Yaris II guide says it was only fully fixed in the next model.
Check for the garage: Check the history for oil top-ups or replaced pistons; measure consumption between two changes and check the spark plugs.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.