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2005 INFINITI Q45

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By Research the Car 2 min read

2005 INFINITI Q45

Overview

The 2005 INFINITI Q45, a luxury sedan, was known for its powerful V8 engine and refined interior. While generally considered a reliable vehicle for its class, like any car, it has specific areas where owners have reported issues. This analysis focuses on common technical problems beyond routine maintenance, providing insights into potential repair costs and solutions for owners or prospective buyers. Understanding these potential weak points can help in making informed decisions regarding maintenance and repair.

Engine

4.5L V8 (VK45DE)

Timing Chain Tensioner Failure

  • Symptoms: Rattling noise from the front of the engine, especially on startup; check engine light may illuminate.
  • Solution: Replacement of timing chain tensioners, guides, and potentially the timing chain itself.
  • Cost: $1,500 - $3,000

Oil Leaks (Valve Covers/Oil Pan)

  • Symptoms: Visible oil residue around the engine, burning oil smell, low oil level.
  • Solution: Replacement of valve cover gaskets or oil pan gasket.
  • Cost: $300 - $700

Transmission

5-Speed Automatic (RE5R05A)

Harsh Shifting / Slipping

  • Symptoms: Jerky gear changes, delayed engagement, slipping between gears, transmission warning light.
  • Solution: Transmission fluid and filter change, solenoid replacement, or in severe cases, transmission rebuild.
  • Cost: $500 - $3,500

Suspension

Active Suspension System

Fluid Leaks / Pump Failure

  • Symptoms: Vehicle leaning to one side, bouncy ride, warning lights on the dashboard related to suspension.
  • Solution: Repair or replacement of leaking suspension lines, struts, or the hydraulic pump.
  • Cost: $800 - $2,500

Electrical

Body Control Module (BCM)

Intermittent Electrical Gremlins

  • Symptoms: Malfunctioning power windows, door locks, interior lights, or dashboard warning lights appearing randomly.
  • Solution: Diagnosis and potential reprogramming or replacement of the BCM.
  • Cost: $500 - $1,200

Alternator

Premature Failure

  • Symptoms: Dimming headlights, battery warning light, difficulty starting the engine, electrical system malfunctions.
  • Solution: Replacement of the alternator.
  • Cost: $400 - $800

Exterior

Standard Chassis

No Major Issues

  • Symptoms: No widespread issues reported.
  • Solution: No widespread issues reported.
  • Cost: N/A

Interior

Infotainment System / Navigation

Screen Malfunctions / Freezing

  • Symptoms: Navigation screen becomes unresponsive, displays errors, or freezes.
  • Solution: Software update, or replacement of the infotainment unit.
  • Cost: $300 - $1,000

Climate Control System

Actuator Failure

  • Symptoms: Airflow not directing correctly (e.g., stuck on defrost), inconsistent temperature.
  • Solution: Replacement of faulty HVAC actuators.
  • Cost: $200 - $500

Summary Verdict

The 2005 INFINITI Q45 offers a luxurious driving experience, but potential buyers and current owners should be aware of specific reliability concerns. The 4.5L V8 engine can experience timing chain tensioner issues, and oil leaks are not uncommon. The 5-speed automatic transmission may develop harsh shifting problems. The active suspension system is a notable area for potential costly repairs due to leaks or pump failures. Electrical gremlins stemming from the BCM and premature alternator failure are also reported. Interior issues primarily revolve around the infotainment screen and climate control actuators. While not a universally problematic vehicle, addressing these potential issues proactively through diligent maintenance and inspection can help ensure a more reliable ownership experience.

INFINITI, Q45
INFINITI Q45 2005
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