Mazda 3

Soot deposits block the oil supply to the turbo radial bearing. The structurally tight oil quantity (380 instead of 500 ml/min) accelerates wear. A short cool-down period after hard driving helps.

Symptoms: Whistling noise from turbo, power drop, limp mode, exhaust smoke

The high-pressure pump metering valve fails and the pump seizes. Metal particles reach all injectors — total failure of the injection system. The entire system must be replaced.

Symptoms: Engine won't start, all injectors failed simultaneously, power drop to zero

The DPF does not fully regenerate with short-trip driving. Eolys additive must be topped up every 60,000 km. A clogged DPF also stresses the turbocharger through increased exhaust backpressure.

Symptoms: DPF warning light, power loss, elevated consumption, limp mode

The PSA diesel injectors and their copper sealing rings leak. Individual repair is usually not possible; replacing all injectors is expensive. Clean installation is critical.

Symptoms: Soot accumulation around injectors, exhaust smell inside the cabin, rough running, starting difficulties

Especially pre-facelift vehicles up to 2006 tend to develop significant corrosion on wheel arches, sills, door bottom edges and tailgates. Without subsequent cavity sealing rust-through sets in early.

The electric power steering fails intermittently, often triggered by a weak battery or corroded earth points. The car can then only be steered with noticeably more effort.

The rubber bushings on the front control arms wear from 80,000–125,000 km. As bushings cannot be replaced separately, the entire control arm must be swapped, increasing repair costs.

Tailgate damper brackets can rust and break due to salt ingress. In extreme cases parts can fall off or the tailgate drops uncontrolled. Mazda carried out a worldwide recall.

Shock absorbers are frequently flagged at MOT inspections and need renewing from around 80,000–100,000 km. Combining with control arm replacement significantly increases overall cost.