2015 Infiniti QX50 3.0L Diesel · GK65 NPP

The 3.0-litre V9X V6 turbodiesel fitted to EX30d and QX50 diesel models is susceptible to diesel particulate filter (DPF) soot accumulation and exhaust gas pressure sensor tube blockage when used primarily for short urban trips. Incomplete active regeneration cycles lead to excessive soot buildup, triggering limp-home mode and illuminating the engine management light. Furthermore, fuel dilution of the engine oil can occur if regeneration is repeatedly aborted. In severe cases, the DPF must be removed for professional off-car thermal cleaning or replacement. Sourcing specialized V9X sensors and emissions hardware has become increasingly expensive since Infiniti's UK market exit.

The heavy 1.9-tonne kerbweight of the EX and QX50, combined with UK potholes and speed cushions, places immense mechanical strain on the front suspension lower control arms. In particular, the large fluid-filled rear compliance bushes (often called the banana arm bushes) perish, crack, and leak their damping silicone oil. Once deflated, the front suspension develops significant play, leading to noticeable knocking over road irregularities, wandering under heavy braking, and rapid wear on the inner edges of the front tyres. Replacement requires fitting new lower control arms or pressing in upgraded polyurethane or heavy-duty replacement bushes.