Mitsubishi ASX 1.6 GA

The 4A92 engine uses a timing chain designed for the engine's lifetime, but the hydraulic tensioner can lose oil pressure over time. This allows the chain to develop slack, producing a distinctive metallic rattle for a few seconds after cold start, which disappears once oil pressure builds. The issue typically appears between 100,000-150,000 km and is more common on cars with extended oil change intervals. If the rattle lasts more than a few seconds or occurs at warm idle, the chain, guides, tensioner, and sprockets all need replacing. At an independent shop, expect €800-1,200; at a dealer, €1,400-1,800. Mitsubishi has released updated tensioner parts for later production runs. Ignoring the rattle risks the chain skipping a tooth and causing valve-to-piston contact.

One of the most widely reported ASX issues across all production years. The tailgate develops rust around the boot switch area and between the upper and lower panels, caused by uneven sealant application at the factory that allows water ingress. Early signs are paint bubbling around the switch. The problem affects cars from all model years but is most commonly seen on 2010-2015 examples. If caught early, a localized repair costs €300-500. If corrosion has spread between panels, a full tailgate respray or replacement runs €800-1,200. Mitsubishi's perforation rust warranty (typically 12 years in Europe) may cover the repair on newer examples. Boot switches themselves can fail from water ingress and cost €30-60 to replace.

Mitsubishi recalled over 52,000 ASX models (KBA reference 14480R) for this issue, affecting cars built between 2011 and 2019. The weld between the rear muffler and the tailpipe can crack due to vibration fatigue and corrosion, potentially causing the tailpipe to detach while driving. Even if the recall was completed, the underlying weld quality means this area remains a weak point as the car ages. An aftermarket replacement rear section costs €200-350 fitted. A dealer OEM replacement runs €400-600. A second recall in 2025 covering similar tailpipe cracking on 2010-2019 models underscores the persistent nature of this design weakness.

The ASX front suspension uses MacPherson struts with separate anti-roll bar links and lower control arms with integrated ball joints. Anti-roll bar links are the most common failure point, producing a knocking sound over bumps, typically after 60,000-80,000 km. These are inexpensive at €20-40 per link plus €50-100 labor per side. Lower ball joints and strut top mounts also wear, especially on cars driven on rough roads. TUV inspectors frequently flag these items. A full front suspension refresh with links, ball joints, and strut mounts costs €400-800 depending on how many components need replacement. Individual link replacement is under €200.

The 4A92 uses individual coil-on-plug ignition coils that can degrade with age and mileage. Symptoms include rough idle, misfires under load, and a check engine light with codes P0301-P0304. A single aftermarket coil costs €20-40, while OEM units run €50-80. Labor is minimal as the coils sit on top of the engine and are easily accessible. Replacing all four coils preventively along with spark plugs costs €150-400 depending on parts choice. The recommended replacement interval is approximately 100,000-120,000 km. This is a common wear item on most 4-cylinder engines and not specific to the 4A92.

Some 4A92 engines develop increased oil consumption after 120,000 km, most commonly due to piston ring wear or deteriorating valve stem seals. Forum reports describe the oil control rings sticking over time, particularly on engines where oil change intervals were stretched. Symptoms include needing to top up between services and faint blue smoke on acceleration. If consumption stays below 0.5L per 1,000 km, regular top-ups (€100-150/year) are the practical solution. Excessive consumption requiring a piston ring replacement costs €2,000-2,500 including labor. This affects a minority of engines, typically those with irregular maintenance histories.