KNOWN FAULTS · Toyota

Toyota iQ 1.4 D-4D common problems.

2009–2015 · Diesel

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

2 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.

Injectors, dual-mass flywheel and oil consumption on the 1.4 D-4D (1ND-TV)Injection / turbo

Engine / equipment: 1.4 D-4D (1ND-TV): Yaris, Yaris Verso, iQ, Urban Cruiser, Corolla, Auris and Verso-S
Period mentioned: Approx. 2001–2018
Symptoms: Hard starting, rough idle, smoke and loss of power; noise or vibration from the flywheel when starting and releasing the clutch; oil consumption.
Possible cause described: Soot builds up in the injectors and EGR valve, especially with many short trips. The dual-mass flywheel wears and, in the worst case, damages the gearbox. Failures of the rail pressure regulator and oil consumption through the turbo or crankcase ventilation are also reported.
Check for the garage: Read the codes, run an injector back-leak test and check the EGR. Listen to the flywheel at idle with the clutch released. Measure oil consumption.
Cost cited in the source: Approx. €1,000–1,600 for dual-mass flywheel and clutch (German guide).A rough figure from the original database, not an up-to-date quote.