KNOWN FAULTS · Toyota

Toyota Aygo (I) 1.4 D-4D common problems.

2005–2014 · 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.

Turbo, injectors and clutch on the Aygo 1.4 D-4DInjection / turbo

Engine / equipment: Toyota Aygo I 1.4 D-4D (PSA 1.4 HDi diesel engine)
Period mentioned: 2005–2010
Symptoms: Loss of power, smoke and turbo whistle; hard starting or rough idle from the injectors; a clutch that slips or is replaced more often than normal.
Possible cause described: The German guide says that, apart from the turbo and injectors, the diesel has no notable problems; it also mentions clutches that often need replacing on the Aygo I.
Check for the garage: Listen to the turbo and check its shaft for play or oil; run an injector back-leak test; test the clutch pulling away on a hill; check recalls by VIN (accelerator pedal 2/2005–8/2009).
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.