Quick Answer

A useful pre-purchase inspection combines VIN and service-history review, a cold start, full-system scan, underbody and fluid inspection, tire and brake measurements, suspension and steering checks, and a road test. The technician should adapt the checklist to the exact Q50, QX50, QX60, QX80, G37, or other model rather than treating every Infiniti the same.

What Records Should You Request First?

Ask for the VIN, title status, maintenance invoices, recall or campaign history, and documentation for major repairs. A seller's verbal statement that “everything was done” is less useful than dates, mileage, fluid specifications, and part descriptions.

Compare the records with the model-year maintenance guide. Look for unexplained mileage gaps, repeated warning-light diagnosis, multiple batteries, recurring tire replacement, transmission work, cooling repairs, or modifications that were later removed.

Why Scan the Vehicle When No Lights Are On?

A full-system scan can reveal pending, history, communication, ABS, AWD, steering, airbag, or transmission codes that are not turning on the check engine light. Readiness monitors can also show whether codes were recently cleared.

Codes do not automatically make a vehicle a bad purchase, but they change the risk and the follow-up testing. A recently disconnected battery may erase evidence while also resetting window, steering, or emissions adaptations.

Which Infiniti-Specific Areas Deserve Attention?

On an earlier QX60 or JX35, transmission behavior and CVT history matter. A Q50 3.0t calls for careful inspection of boost, cooling, belt condition, modifications, and oil history. An AWD QX60 needs transfer leaks checked, while a QX80 inspection should include suspension equipment, engine noise, towing history, and underbody wear.

Older G35 and G37 models deserve oil-level, leak, pressure-warning, cooling-hose, suspension, and differential attention. The checklist should follow the actual engine, transmission, and options.

What Mechanical Items Should Be Measured?

  • Tire age, matching size, tread depth, and uneven wear
  • Brake-pad thickness, rotor condition, fluid, and warning lights
  • Battery condition, charging voltage, and signs of repeated discharge
  • Engine, transmission, transfer, differential, coolant, and power-steering leaks
  • Suspension play, shocks, bushings, wheel bearings, and alignment clues
  • Heating, A/C, electronics, cameras, and driver-assistance functions

A list of measurements is more useful than a general “looks good” statement.

What Should Happen During the Road Test?

The vehicle should be driven from cold when possible and under several safe conditions: idle, light and moderate acceleration, steady cruising, braking, turns, parking-lot maneuvers, and highway speed. The technician watches temperatures, fuel control, transmission behavior, wheel-speed data, and warning status.

Listen for belt chirp, turbo noise, wheel-bearing hum, suspension clunks, driveline vibration, and engine knock. Confirm that the steering returns normally and that the vehicle does not pull or shake.

How Should You Use the Inspection Report?

The report should separate safety repairs, overdue maintenance, developing concerns, and normal wear. Request realistic priorities and approximate next steps rather than a simple pass-or-fail verdict.

Use the findings to negotiate, request documentation, or walk away. Schedule through Fastlane's pre-purchase inspection guide and connect model-specific repairs to the main Infiniti service page.