2008 INFINITI FX45

Here’s a breakdown of common issues and complaints for the 2008 INFINITI FX45, categorized by system. The 2008 INFINITI FX45 is a mid-size luxury SUV known for its sporty handling and powerful engine. The FX45 boasts a 4.5L V8 engine producing 320 horsepower and 335 lb-ft of torque. A less powerful FX35 with a 3.5L V6 engine producing 280 horsepower and 270 lb-ft of torque was also available. Both models were exclusively equipped with a 5-speed automatic transmission. Owners generally appreciate the FX45’s aggressive styling, comfortable interior, and engaging driving experience. Common dislikes often include relatively poor fuel economy and some reliability concerns.

Engine

4.5L V8 (VK45DE)

• Timing Chain Tensioner Failure
  • Description/Symptoms: Rattling noise, especially on startup. Can lead to timing chain skipping, causing significant engine damage.
  • Solution: Replace the timing chain tensioner(s), timing chain, and potentially other related components.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Oil Consumption
  • Description/Symptoms: Excessive oil consumption, requiring frequent top-offs. May notice blue smoke from the exhaust.
  • Solution: Depending on the severity, the solution can range from using a thicker oil, replacing valve stem seals, or a complete engine rebuild.
  • Estimated Cost to Fix: $500 (thicker oil) - $5,000+ (engine rebuild)
  • Recalls: None Found

Transmission

5-Speed Automatic (RE5R05A)

• Valve Body Issues
  • Description/Symptoms: Harsh shifting, slipping between gears, or failure to shift.
  • Solution: Replacing or rebuilding the valve body, or replacing the entire transmission.
  • Estimated Cost to Fix: $800 - $3,500+
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering at low speeds, especially during acceleration.
  • Solution: Replace the torque converter.
  • Estimated Cost to Fix: $1,000 - $2,000+
  • Recalls: None Found

Suspension

• Rear Air Suspension Failure (If Equipped)
  • Description/Symptoms: Vehicle sagging in the rear, compressor running constantly, suspension warning lights.
  • Solution: Replace air struts, compressor, and/or ride height sensors. Conversion to traditional coil springs is also an option.
  • Estimated Cost to Fix: $800 - $3,000+
  • Recalls: None Found
• Front Lower Control Arm Bushing Failure
  • Description/Symptoms: Clunking noise from the front suspension, especially when going over bumps. Poor handling and alignment issues.
  • Solution: Replace the lower control arms or press in new bushings.
  • Estimated Cost to Fix: $400 - $1,000+
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Battery drains overnight or after a few days of sitting.
  • Solution: Diagnose and repair the source of the parasitic draw, which could be a faulty module, relay, or wiring issue.
  • Estimated Cost to Fix: $100 - $500+ (depending on the source)
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door locks not working properly, intermittent locking/unlocking, or no response.
  • Solution: Replace the faulty door lock actuator.
  • Estimated Cost to Fix: $200 - $400+ per door
  • Recalls: None Found

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, getting stuck, or making grinding noises.
  • Solution: Repair or replace the sunroof motor, tracks, or other components.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Interior

• Navigation System Failure
  • Description/Symptoms: Navigation screen freezing, not displaying properly, or system malfunctioning.
  • Solution: Repair or replace the navigation system unit.
  • Estimated Cost to Fix: $300 - $1,000+
  • Recalls: None Found
• HVAC Blend Door Actuator Failure
  • Description/Symptoms: Inconsistent temperature from vents, inability to control temperature properly.
  • Solution: Replace the faulty blend door actuator.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Summary

The 2008 INFINITI FX45 offers a blend of luxury and performance but is prone to several common issues. Engine and transmission problems can be costly, particularly the timing chain tensioner and valve body issues. Electrical gremlins like battery drains and actuator failures can also be frustrating. Suspension issues, especially with the air suspension (if equipped), require attention. Overall, potential buyers should be aware of these potential issues and factor in potential repair costs when considering this vehicle. Severity ranges from minor inconveniences to major mechanical failures requiring significant investment.