2003 INFINITI FX45

The 2003 INFINITI FX45 was a groundbreaking vehicle, a performance-oriented crossover SUV that blended sporty handling with luxurious features. It came equipped with a potent 4.5L VK45DE V8 engine producing 315 horsepower and 329 lb-ft of torque, paired with a 5-speed automatic transmission. People often liked the FX45’s unique styling, powerful engine, and sporty handling. Dislikes often centered on the firm ride quality, dated interior, and higher fuel consumption compared to more modern SUVs. The FX35 was also available with a 3.5L V6 engine.

Engine

4.5L VK45DE V8

• Oil Consumption
  • Description/Symptoms: Some owners have reported excessive oil consumption, requiring frequent top-offs between oil changes.
  • Solution: Monitor oil levels regularly. Address any leaks. If consumption is severe, consider an engine inspection to check for worn piston rings or valve seals.
  • Estimated Cost to Fix: $2,000 - $5,000+ depending on the cause and repair needed.
  • Recalls: None Found
• Timing Chain Tensioner Failure
  • Description/Symptoms: Rattling noise upon start-up, especially when cold. Can lead to serious engine damage if not addressed.
  • Solution: Replace the timing chain tensioner and potentially the timing chain and guides.
  • Estimated Cost to Fix: $1,000 - $2,000+
  • Recalls: None Found
• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaks around the valve covers, leading to a burning smell and potential oil drips.
  • Solution: Replace the valve cover gaskets.
  • Estimated Cost to Fix: $200 - $500
  • Recalls: None Found

Transmission

5-Speed Automatic Transmission

• Torque Converter Issues
  • Description/Symptoms: Shuddering or vibrations during acceleration, especially at lower speeds. Can also cause harsh shifting.
  • Solution: Replace or rebuild the torque converter.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found
• Slipping or Erratic Shifting
  • Description/Symptoms: Transmission slipping between gears, delayed or harsh shifts, or failure to shift properly.
  • Solution: Perform a transmission fluid flush and filter change first. If that doesn’t resolve the issue, a transmission rebuild or replacement may be necessary.
  • Estimated Cost to Fix: $200 (fluid change) - $3,000+ (rebuild/replacement)
  • Recalls: None Found

Suspension

• Rear Suspension Air Ride Failure (If Equipped)
  • Description/Symptoms: Rear of the vehicle sagging or not maintaining the correct ride height, compressor failing, or warning lights illuminated.
  • Solution: Replace the air struts, compressor, or associated air lines as needed. Consider converting to a traditional coil-spring suspension as an alternative.
  • Estimated Cost to Fix: $500 - $2,000+ per strut, $500-$1000 for compressor, $800-$1500 for coil conversion
  • Recalls: None Found
• Front Strut Mount Failure
  • Description/Symptoms: Clunking noises from the front suspension, especially when going over bumps.
  • Solution: Replace the front strut mounts.
  • Estimated Cost to Fix: $300 - $600 per side
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Battery frequently dying, especially after the car sits for a few days.
  • Solution: Diagnose and repair the source of the parasitic draw. Common causes include faulty door actuator.
  • Estimated Cost to Fix: $100 - $500+ depending on the cause.
  • Recalls: None Found
• Window Motor Failure
  • Description/Symptoms: Windows failing to go up or down, or moving slowly.
  • Solution: Replace the window motor.
  • Estimated Cost to Fix: $200 - $400 per window.
  • Recalls: None Found

Exterior

• Rust (Especially in Northern Climates)
  • Description/Symptoms: Rust forming on the undercarriage, wheel wells, and around body panels.
  • Solution: Treat and repair rust spots. Apply rust inhibitors to prevent further corrosion.
  • Estimated Cost to Fix: $100 - $1,000+ depending on the severity.
  • Recalls: None Found

Interior

• Navigation System Failure
  • Description/Symptoms: Navigation system malfunctioning, screen freezing, or inability to acquire GPS signal.
  • Solution: Replace the navigation unit or seek repair if possible (availability of parts and service may be limited).
  • Estimated Cost to Fix: $300 - $1,000+ (if repairable, replacement may be difficult to source)
  • Recalls: None Found
• Climate Control Issues
  • Description/Symptoms: Climate control system blowing hot or cold air intermittently, or failing to adjust temperature properly.
  • Solution: Diagnose and repair the issue. Common causes include a faulty blend door actuator or a refrigerant leak.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Summary

The 2003 INFINITI FX45, while a stylish and sporty SUV, has several common issues that potential buyers should be aware of. Engine issues like oil consumption and timing chain tensioner failure can be costly to repair. Transmission problems such as torque converter issues can also lead to significant expenses. Suspension and electrical gremlins add to the list of potential headaches. While some issues are relatively minor and inexpensive to fix, others can be quite severe and require substantial investment. A thorough pre-purchase inspection is highly recommended to identify and address any existing problems before committing to a purchase.