Most common 2005 Infiniti Q45 problems
Share of the 4 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Infiniti Q45 complaints by model year
Best Q45 years: 2003, 2005, 2001. Years to avoid: 2002. Compare all years →
2005 Infiniti Q45 recalls (3)
Air bags › Side/window
Nissan is recalling certain model year 2003-2005 Infiniti q45 vehicles. A wiring connector for the seat mounted airbag May experience increased electrical resistance, resulting in the non-deployment of the side air bags.
Remedy: Nissan will notify owners, and dealers will modify the wiring connector, free of charge. The safety recall began on March 19, 2012. Owners May contact Nissan customer service at 1-800-647-7261.
Exterior lighting › Brake lights
Certain vehicles fail to comply with the stop lamp and reflex reflector requirements of federal motor vehicle safety standard no. 108, 'lamps, reflective devices, and associated equipment."
Remedy: Dealers will replace the rear combination lamp assemblies free of charge. The recall is expected to begin on or about April 16, 2007. Owners May contact Infiniti at 1-800-662-6200.
Child seat › Latch strap
Certain passenger vehicles equipped with power rear seats fail to conform to the requirements of federal motor vehicle safety standard no. 225, "child restraint anchorage systems." the lower anchorage brackets in the rear seats do not meet the location requirement in this standard.
Remedy: Dealers will replace the lower anchorage brackets with modified ones to ensure that the standard is met. The recall began on October 17, 2005. Owners May contact Infiniti at 1-800-662-6200.
NHTSA defect investigations
Federal safety investigators have looked into 2 possible defects involving the 2005 Infiniti Q45:
Side air bag non-deployment
The subject vehicles are equipped with seat-mounted, side torso air bags for the driver and front passenger.this investigation has revealed that faulty side air bag module connectors located under the front seats can cause an interruption in the electrical current that will drop the input voltage below the specified range.as a result, the air bag warning lamp illuminates and the affected side air bag is…
Non-deployment of Side Thorax Air Bags
The subject vehicles are equipped with seat-mounted, side thorax air bags for the driver and front passenger.This investigation revealed that faulty side air bag module electrical connectors located under the driver and front passenger seats can cause an interruption in the electrical circuit that will drop the input voltage below the specified range.As a result, the air bag warning lamp illuminates on the…
2005 Infiniti Q45 engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 4.5L 8-cyl | 5-speed automatic | RWD | 16 / 22 / 18 |
EPA ratings. Class: Midsize car.
Frequently asked questions
Is the 2005 Infiniti Q45 a good car?
Based on 4 owner complaints filed with NHTSA, the 2005 Q45 rates average: 44% fewer complaints than a typical year of the Q45 at the same age. It is one of the best Q45 years by this measure. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2005 Infiniti Q45?
The electrical system — 1 complaint, 25% of all complaints for this model year, most often about ignition. Next are the wheels & tires (1) and air bags (1).
How many recalls does the 2005 Infiniti Q45 have?
There are 3 recalls for the 2005 Infiniti Q45, the most recent from February 28, 2012 (side/window). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Infiniti Q45?
The best years by complaints, compared at the same age, are 2003, 2005 and 2001. Years to avoid or approach with caution: 2002. See the full Infiniti Q45 years comparison.
At what mileage do 2005 Infiniti Q45 problems happen?
The median mileage reported in complaints is about 87,000 miles; 25% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.