Mitsubishi ASX

The diesel particulate filter on the 9HD/R9M clogs with predominantly short-trip use. This engine is not suited to SUV operation in urban traffic. Regeneration requires at least 30 minutes of motorway driving.

Symptoms: DPF warning light, power loss, unusually high oil level (fuel dilution), smoke from exhaust

The R9M/9HD uses a timing belt drive with a 100,000 km or 6-year replacement interval. Exceeding it risks engine damage. Replace water pump, tensioner, and idler rollers at the same time.

Symptoms: Engine cranks without firing, loud metallic noise, engine damage

The EGR valve on the R9M 1.6 DI-D cokes up with typical urban stop-and-go use. The ASX with frequent start-stop operation is particularly vulnerable. Cleaning costs 100–300 EUR, replacement 200–500 EUR.

Symptoms: Limp mode, power loss, check engine light, stumbling under acceleration

The piezo injectors on the R9M/9HD can wear at high mileage (from 150,000 km) and with poor fuel quality. Repair is expensive; replacing all four injectors at once is recommended.

Symptoms: Engine stumbling, misfires, cold-start difficulties, increased fuel consumption

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.