2018 Infiniti QX30 2.1L Diesel · SJ18 XGT

This 2018 Infiniti QX30 has demonstrated a concerning deterioration in mechanical reliability over the past two years, with the most recent MOT test on 6 March 2026—just four months ago—confirming a pattern of critical failures rather than stability. The January 2026 failure alone revealed a severely worn brake disc and a malfunctioning tyre pressure monitoring system, while the February 2024 test exposed both a fractured offside rear coil spring and a degraded brake disc on the same wheel. Though the March 2026 test passed without defects, the history suggests repeated neglect of high-priority components, particularly the rear suspension and braking system. Buyers should treat the vehicle’s roadworthiness with caution, as the absence of defects in the latest test does not negate the structural compromise from the 2024 suspension failure. The mileage progression of 6,646 miles annually aligns with typical usage for a vehicle of this age, but the irregular spacing between tests—particularly the 11-month gap between the 2025 and 2026 MOTs—raises questions about maintenance discipline. The 2024 failure at 45,541 miles, just three days before the subsequent test, indicates a rushed or inadequate inspection cycle, while the 2026 failure at 53,099 miles—only 65 miles before passing—suggests either a last-minute repair or a persistent underlying issue. The absence of intermediate servicing records further complicates assessing whether wear items like brakes, suspension, or fluids were addressed between tests. A buyer should prioritise an independent inspection of the rear suspension, focusing on the offside coil spring and mounting points for signs of fatigue or corrosion, as the 2024 failure on this component is a serious structural risk. The repeated brake disc failures—particularly the offside rear—demand verification that the pads, calipers, and wheel cylinders have been replaced in full, not just the discs. The 2026 failure of the tyre pressure monitoring system also warrants confirmation that the sensor has been reset or replaced, as this could indicate wiring or sensor corrosion. Given the history, corrosion checks on the subframe, sills, and wheel arches are advisable, as prolonged standing or poor undersealing may have accelerated deterioration.