Infiniti Common Problems & Known Faults

How reliable are Infiniti cars?

Our database covers 2 Infiniti models and 10 documented faults across the range. Among these, 6 are rated as major issues that typically require significant repairs.

According to DVSA MOT test data, Infiniti models fail at an average rate of 14.8%, sitting below the 22.7% average across all manufacturers in our database. Reliability varies considerably between models. The Q30 is the strongest performer at just 12.6%, while the Q50 has the highest failure rate at 17%.

If you are considering a used Infiniti, researching the specific model and generation you are looking at makes a real difference. The most common failure areas across the range are suspension and brakes, though each model has its own particular weak points. This page gives you a complete breakdown by severity, the models affected, and what repairs typically cost at UK garages.

Infiniti reliability summary

Where Infiniti problems occur

Understanding which systems are most prone to failure helps you focus during a test drive or pre-purchase inspection. Here is how Infiniti's 10 known issues break down by area.

Suspension problems dominate, accounting for 3 of the 10 faults we track (30%). Issues in this area include Suspension joint dust cover failure (H15) and Suspension component excessive wear (V37). The most affected models are the Q50 (2), the Q30 (1).

Brakes is the next most common area, with 3 documented faults (30%). Common faults here include Premature brake disc wear (H15) and Premature brake pad wear (V37). The most affected models are the Q50 (2), the Q30 (1).

We also track 3 engine faults across the range (30%). Problems to watch for include Engine management light - emissions system (H15) and Turbocharger actuator failure (H15). The most affected models are the Q30 (2), the Q50 (1).

Transmission rounds out the top problem areas with 1 known issues (10%). Notable issues include Dual-clutch transmission jerky operation (H15). The most affected models are the Q30 (1).

Known Infiniti faults by severity

Every fault in our database is rated by severity based on its potential safety impact and typical repair cost. Below is a sample of issues at each level, with links to the affected model pages where you can read the full details.

Top issues across the Infiniti range

The most common and severe problems found across all Infiniti models, ranked by severity and how many models are affected.

Problems by Infiniti model

We track faults across 2 Infiniti models. Each model page includes every known issue, generation-specific details, UK repair costs, and MOT failure data. Select a model below to see its full breakdown.

What to check before buying a used Infiniti

Every used Infiniti deserves a thorough inspection, but knowing the common weak points for your target model gives you a serious advantage. Since suspension faults are the most common across the range, pay particular attention to this area during any viewing or test drive.

A complete dealer service history is one of the strongest indicators of how well a Infiniti has been looked after. Many of the faults on this page are preventable or can be caught early through regular servicing. If the seller cannot produce service records, treat that as a significant red flag.

Check the MOT history carefully too. With a 14.8% average failure rate across the Infiniti range, some advisories and minor failures are normal over the life of any car. What matters is the pattern: recurring failures in the same area suggest an underlying problem, while a history of clean passes is encouraging.

Infiniti repair costs: what to expect

Across all documented faults, the average Infiniti repair costs between £180 and £409 at an independent garage. At the top end, the most expensive single repair can reach £800 or more. Main dealer rates are typically 30% to 50% higher across the board.

The single most expensive Infiniti repair in our database is Suspension component excessive wear (V37), which can cost £600–£1,500 at a main dealer.

These figures are based on reported UK repair costs and serve as a guide. Actual prices will vary depending on your location, the garage, and the parts required. Getting quotes from two or three specialists before committing to any major work is always worthwhile.