2002 INFINITI Q45

The 2002 INFINITI Q45 is a luxury sedan known for its comfortable ride, powerful engine, and refined interior. It came with a single engine option: a 4.5L VK45DE V8 producing 340 horsepower and 333 lb-ft of torque, paired with a 5-speed automatic transmission. Owners often praise the car’s smooth acceleration, spacious cabin, and long-lasting reliability. However, some common complaints include electrical issues, suspension problems related to the active suspension system (if equipped), and the age-related deterioration of various components.

Engine

4.5L VK45DE V8

• Timing Chain Tensioner Failure
  • Description/Symptoms: Rattling noise upon startup, especially when cold. Can lead to eventual timing chain failure and significant engine damage if left unaddressed.
  • Solution: Replace the timing chain tensioner and inspect the timing chain guides for wear.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: Visible oil leaks from valve cover gaskets, oil pan gasket, or rear main seal. Burning oil smell.
  • Solution: Replace the leaking gasket or seal.
  • Estimated Cost to Fix: $200 - $800+ depending on the location.
  • Recalls: None Found
• Catalytic Converter Failure
  • Description/Symptoms: Check Engine Light illuminated with codes related to catalytic converter efficiency (e.g., P0420, P0430). Reduced engine performance.
  • Solution: Replace the faulty catalytic converter(s).
  • Estimated Cost to Fix: $800 - $2000+
  • Recalls: None Found

Transmission

5-Speed Automatic

• Slipping or Harsh Shifting
  • Description/Symptoms: Transmission slipping between gears, harsh or delayed shifts, especially when cold.
  • Solution: Perform a transmission fluid flush and filter change, and in some cases replace the valve body. If the problem persists, a transmission rebuild or replacement may be necessary.
  • Estimated Cost to Fix: $300 - $3000+ depending on the severity.
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering or vibrations at low speeds, especially during torque converter lockup. Stalling.
  • Solution: Replace the torque converter.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found

Suspension

• Active Suspension Issues (if equipped)
  • Description/Symptoms: Warning lights related to the active suspension system. Erratic ride height. Stiff or bouncy ride.
  • Solution: Diagnose the specific issue with the active suspension system (e.g., faulty actuators, sensors, or control module). Replacing components can be expensive.
  • Estimated Cost to Fix: $500 - $3000+ depending on the component.
  • Recalls: None Found
• Air Suspension Leaks (if equipped)
  • Description/Symptoms: Car sagging on one or more corners overnight. Compressor running excessively.
  • Solution: Locate and repair the air leak, often in the air struts or lines.
  • Estimated Cost to Fix: $500 - $2000+ per strut.
  • Recalls: None Found
• Worn Suspension Bushings
  • Description/Symptoms: Clunking noises from the suspension, especially over bumps. Loose steering feel.
  • Solution: Replace worn suspension bushings (e.g., control arm bushings, sway bar bushings).
  • Estimated Cost to Fix: $300 - $1000+ depending on the bushings replaced.
  • Recalls: None Found

Electrical

• Battery Drain Issues
  • Description/Symptoms: The battery draining overnight or within a few days, requiring frequent jump starts.
  • Solution: Diagnose and repair the parasitic draw. Check for aftermarket accessories, faulty relays, or a failing alternator.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found
• Window Regulator Failure
  • Description/Symptoms: Window not going up or down, or going up/down very slowly. Grinding noises from inside the door.
  • Solution: Replace the window regulator.
  • Estimated Cost to Fix: $200 - $500+ per window.
  • Recalls: None Found
• Alternator Failure
  • Description/Symptoms: Dimming headlights, warning lights on the dashboard, battery not charging, stalling.
  • Solution: Replace the alternator.
  • Estimated Cost to Fix: $300 - $600+
  • Recalls: None Found

Exterior

• Rust
  • Description/Symptoms: Rust forming on the undercarriage, wheel wells, and lower body panels.
  • Solution: Remove rust and repaint or repair the affected areas.
  • Estimated Cost to Fix: $200 - $2000+ depending on the severity.
  • Recalls: None Found

Interior

• Navigation System Failure
  • Description/Symptoms: Navigation screen not working, GPS signal loss, outdated maps.
  • Solution: This is a common issue for older vehicles. You can either replace the navigation system or find a repair shop that specializes in repairing the navigation system.
  • Estimated Cost to Fix: $200 - $1000+
  • Recalls: None Found
• Climate Control Issues
  • Description/Symptoms: Air conditioning not working properly, heater blowing cold air, temperature blend doors failing.
  • Solution: Diagnose and repair the specific issue with the climate control system (e.g., refrigerant leak, faulty compressor, or blend door actuator).
  • Estimated Cost to Fix: $200 - $1000+ depending on the issue.
  • Recalls: None Found
• Sunroof Issues
  • Description/Symptoms: Sunroof gets stuck, doesn’t close properly, or the motor fails.
  • Solution: Replace the sunroof motor or repair the sunroof assembly.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Summary

The 2002 INFINITI Q45 offers a luxurious and powerful driving experience, but potential buyers should be aware of the common issues associated with this model year, particularly the timing chain tensioner, suspension issues, and electrical problems. While some repairs can be relatively inexpensive, others, such as active suspension repairs or transmission work, can be quite costly. Rust is also a concern in certain climates. Careful inspection and a pre-purchase inspection by a qualified mechanic are highly recommended.