Infiniti QX70 (FX) Common Problems & Reliability
Formerly known as the FX, the Infiniti QX70 is a striking, aggressive-looking luxury SUV that prioritized sporty handling and swooping design over outright practicality. It drove more like a tall sports car than a traditional SUV, offering a firm ride and potent V6 engines, including a raucous 3.7-litre petrol and a muscular 3.0-litre diesel. In the UK, its bold styling and massive 21-inch wheels gave it immense road presence, though its heavy fuel consumption limited its appeal. Reliability is excellent, underpinned by proven Nissan mechanicals. It is best suited for buyers who want an imposing, sporty, and reliable SUV, and are willing to accept high running costs and a relatively small boot.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common Infiniti QX70 (FX) Faults & Repair Costs
V9X Diesel EGR and DPF Clogging
The 3.0L diesel engine is prone to carbon buildup in the EGR valve and DPF, especially if used for short urban trips.
Limp mode, Engine warning light, Poor fuel economy, Hesitation
- Check for DPF regeneration history
- Take the car for a long motorway run to ensure no lights appear
Dashboard Bubbling
A known cosmetic defect where the dashboard material delaminates and creates small bubbles. It is purely aesthetic but very expensive to fix properly.
Small bumps or bubbles appearing on the dashboard top
- Inspect the dashboard surface closely in direct light
Brake Disc Warping
The FX/QX70 is a heavy car, and spirited driving can lead to warped front brake discs, causing vibration under braking.
Steering wheel judder when braking, Pulsing brake pedal
- Apply the brakes firmly from 60mph (where safe) and feel for vibrations
Buying a used Infiniti QX70 (FX)? 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.