Most common 2004 Infiniti Q45 problems
Share of the 7 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 →
2004 Infiniti Q45 recalls (2)
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 › Switch
On certain passenger vehicles, the brake lamp switch May malfunction.
Remedy: Dealers will replace the brake lamp switch. The recall began on October 25, 2004. Owners should contact Infiniti at 1-800-662-6200.
NHTSA defect investigations
Federal safety investigators have looked into 2 possible defects involving the 2004 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…
What 2004 Infiniti Q45 owners say
Electrical system
My low beam headlamp system has now failed at two separate times, both during nighttime driving. The first was on November 2, 2009, at 37,600 miles, the left HID ballast failed; Nissan repaired the failure under warranty although its time-portion had expired. The second failure was at 47,600 miles on December 1, 2011. Nissan/Infiniti consumer affairs were told and acknowledged that mileage warranty was no-where-near expired - but time had - yet, talked as though they would help with the repair. The quid-pro-quo was that I get an Infiniti dealer to verify problem and cost to repair. At my cost of $125.88 the Infiniti dealer agreed the right ballast was now bad; cost to repair approximately $1100. Nissan consumer affairs were instructed (according to ca) by a higher echelon of Nissan not to repair. Ca did agree to refund my dealer cost of $125.88. …
2004 Infiniti Q45 lemon this automobile has an in-service date of 12-17-04, purchased by me on 02-08-08 at 26,670 miles with 10 months remaining on the time warranty that's expired. It was returned to major Infiniti on 09-29-10 with 42,171 miles ^0,000 warranty) and an inoperative driver's seat (no rear/forward function) fixed in an unsafe position for me and impossible for my wife - (7) inches shorter. After diagnosis, major informed me the repair cost would be $1300 and that Infiniti refused any warranty responsibility. I called Nissan consumer affairs and spoke to emily who gave me a file # [redacted] and told me a regional specialist would call within two days, next day, September 30, I called nca again and talked to [redacted], regional specialist. She told me I couldn't have an answer on nca covering the seat problem until Monday 10-4-10. …
2004 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 2004 Infiniti Q45 a good car?
Based on 7 owner complaints filed with NHTSA, the 2004 Q45 rates average: 33% fewer complaints than a typical year of the Q45 at the same age. 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 2004 Infiniti Q45?
The electrical system — 3 complaints, 43% of all complaints for this model year. Next are the speed control & acceleration (2) and lights (2).
How many recalls does the 2004 Infiniti Q45 have?
There are 2 recalls for the 2004 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 2004 Infiniti Q45 problems happen?
The median mileage reported in complaints is about 42,000 miles; 60% 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.