2004 INFINITI FX45

The 2004 INFINITI FX45 is a sporty SUV known for its powerful performance and distinctive styling. It came with two engine options: a 3.5L V6 (FX35) and a 4.5L V8 (FX45), both paired with a 5-speed automatic transmission. The 4.5L V8 produces around 315 horsepower and 329 lb-ft of torque. Owners generally appreciate the FX45’s strong acceleration, sporty handling, and luxurious interior. Common dislikes include its relatively poor fuel economy and some reliability concerns as it ages.

Engine

4.5L VK45DE V8

• Timing Chain Tensioner Failure
  • Description/Symptoms: Rattling noise upon startup, especially when cold. Can lead to engine damage if not addressed.
  • Solution: Replace the timing chain tensioners and guides.
  • Estimated Cost to Fix: $1,000 - $2,000+
  • Recalls: None Found
• Oil Consumption
  • Description/Symptoms: Excessive oil consumption, requiring frequent oil top-offs. May be due to worn piston rings or valve stem seals.
  • Solution: Depending on the cause and severity, repairs may range from using a heavier weight oil and replacing the PCV valve to a complete engine rebuild.
  • Estimated Cost to Fix: $50 (PCV Valve) - $5,000+ (Engine Rebuild)
  • Recalls: None Found

Transmission

5-Speed Automatic

• Valve Body Issues
  • Description/Symptoms: Harsh or delayed shifting, slipping between gears, or failure to shift.
  • Solution: Replacement or rebuild of the valve body
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Suspension

• Front Strut Failure
  • Description/Symptoms: Clunking noises from the front suspension, bouncy ride, poor handling.
  • Solution: Replace front struts.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• Rear Self-Leveling Suspension Issues
  • Description/Symptoms: Sagging rear suspension, especially when loaded. Failure of the self-leveling system.
  • Solution: Replacement of the air springs or shocks. Conversion to a standard suspension system.
  • Estimated Cost to Fix: $500 - $2,000+ (depending on the repair)
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Battery draining overnight or within a few days, requiring frequent jump starts. Could be caused by a parasitic draw from a faulty module or accessory.
  • Solution: Diagnose and repair the source of the parasitic draw.
  • Estimated Cost to Fix: $100 - $500+ (depending on the complexity of the issue)
  • Recalls: None Found
• Driver Side Window Switch Failure
  • Description/Symptoms: Driver side window switch failing to properly operate driver side window
  • Solution: Replace the driver side window switch
  • Estimated Cost to Fix: $100 - $300
  • Recalls: None Found

Exterior

• Headlight Housing Cracking
  • Description/Symptoms: Headlight housing cracking
  • Solution: Replace headlight housing
  • Estimated Cost to Fix: $300 - $600
  • Recalls: None Found

Interior

• Navigation System Failure
  • Description/Symptoms: Navigation screen is dead
  • Solution: Replace navigation screen
  • Estimated Cost to Fix: $500 - $1,500
  • Recalls: None Found

Summary

The 2004 INFINITI FX45 can be a fun and powerful SUV, but potential buyers should be aware of common issues related to its aging components. Engine problems, particularly timing chain tensioner failure and oil consumption, can be costly to repair. Transmission issues, suspension problems, and electrical gremlins are also common. Repair costs can range from a few hundred dollars for minor fixes to several thousand dollars for major engine or transmission work. Careful inspection and a pre-purchase inspection by a qualified mechanic are highly recommended before purchasing a used FX45.