Mitsubishi ASX

During DPF regeneration diesel fuel enters the engine oil. Oil level rises instead of dropping. Diluted oil loses its lubricating properties. Early model years particularly affected; Mitsubishi revised the software later.

Symptoms: Oil level rises above maximum, engine oil smells of diesel, DPF warning light, increased engine noise

Common-rail injectors clog or lose sealing at higher mileages. Return-flow rate increases, leading to starting problems and rough running.

Symptoms: Difficult cold start, rough idle, power loss, check engine light

The turbocharger loses performance through blocked oil lines or bearing wear. Oil lines clogged by DPF-related oil dilution accelerate wear further.

Symptoms: Whistling from turbo, power loss, blue smoke, oil in the charge air pipe

The EGR valve and intake manifold clog with soot deposits. Short-trip driving makes the problem worse. Cleaning or replacement every 80,000–120,000 km recommended.

Symptoms: Power loss, rough idle, check engine light, increased fuel consumption

The dual-mass flywheel wears with short-trip and frequent stop-and-go driving. The DMF should always be replaced together with a clutch change.

Symptoms: Rumbling on start and shut-down, vibrations at idle, shuddering on pull-away

From the third MOT onwards (approx. 7+ years) steering ball joints fail comparatively often and regularly result in inspection advisories. Replacement requires a specialist because wheel alignment work is necessary.

Older ASX models show an above-average defect rate for foot brake and handbrake at MOT inspections. Brake discs and pads wear unevenly; the parking brake is prone to corrosion in wet conditions.

Particularly older examples (pre-2015) show rust formation on the tailgate as well as wheel arches, door sills, and underbody. Mitsubishi frequently covered tailgate repairs under goodwill. Underbody treatment in the first year is strongly recommended.