Mitsubishi ASX Common Problems & Reliability
The Mitsubishi ASX, launched in 2010 and heavily facelifted over a decade-long production run, is a rugged, "old-school" compact crossover that shares its underlying platform with the larger Outlander. Positioned as a direct rival to the original Nissan Qashqai, it prioritized mechanical simplicity, practicality, and a high driving position over cutting-edge technology or soft-touch interior plastics. In the UK, it remains a highly sensible used purchase for those who value dependable Japanese engineering and long-term durability over the latest gadgets. Reliability for the ASX is generally very high, especially for the manual petrol variants, but there are specific engine and transmission combinations that require caution. Early 1.6-litre petrol engines (2011–2015) can suffer from stretched timing chains, identifiable by a rattling noise on cold starts. The diesel engines (1.8 and 2.2-litre) are prone to severe DPF clogging if the vehicle is used purely for short city trips, which can lead to fuel diluting the engine oil—a situation often referred to as "oil rising" on the dipstick. Additionally, models equipped with the CVT automatic gearbox must have their fluid changed regularly to prevent overheating or jerky operation. When buying a used ASX in the UK, the focus should be on matching the powertrain to your driving style. The 1.6-litre petrol manual is the undisputed "safe bet" for urban drivers, offering years of trouble-free motoring provided the timing chain is quiet. Prospective owners of diesel models must check the oil level on the dipstick to ensure it isn’t over-filled (indicating dilution) and verify that the DPF warning light is off. It is also important to test the rear brakes, as the calipers are known to seize if the car sits for long periods. With Mitsubishi having withdrawn from the UK market, ensuring a strong service history is vital, though generic parts remain widely available.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common Mitsubishi ASX Faults & Repair Costs
DPF Clogging (1.8 DI-D)
The diesel particulate filter clogs quickly if the car isn't driven on the motorway regularly.
DPF warning light, Rising oil level, Poor fuel economy
- Check the oil level; if it's high, it suggests aborted DPF regens
Oil Dilution (Diesel)
Interrupted DPF regenerations cause unburnt fuel to leak into the oil sump, raising the oil level and thinning the lubricant.
Oil level above the "X" mark on dipstick, Check engine light, Reduced engine performance
- Check the dipstick for an "X" mark above the Max line
- Verify frequency of long-distance trips
Tailgate Rust
Corrosion often appears around the tailgate handle or bottom edge due to poor drainage and thin paint.
Bubbling paint on tailgate, Rust streaks from handle area
- Inspect the area around the rear handle and the bottom lip of the boot lid
Buying a used Mitsubishi ASX? Always check for hidden finance and write-off history.
Mechanical problems are only half the battle. Over 1 in 3 UK used cars checked have unpaid finance or accident write-off records that could cause you to lose the car or thousands in value.