2002 INFINITI QX4

The 2002 INFINITI QX4 is a luxury SUV based on the Nissan Pathfinder. It was only offered with one engine option, the 3.5-liter VQ35DE V6 engine, producing 240 horsepower and 265 lb-ft of torque. This engine was paired with a 4-speed automatic transmission. Owners generally appreciate the QX4 for its comfortable ride, off-road capability, and upscale features. Common complaints include the vehicle’s age-related maintenance needs, fuel economy, and some specific component failures.

Engine

3.5L VQ35DE V6

• Oil Leaks
  • Description/Symptoms: Oil leaks can develop from various points, including valve cover gaskets, oil pan gasket, front crank seal, and rear main seal. Symptoms include visible oil drips, burning oil smell, and low oil level.
  • Solution: Replace the leaking gaskets or seals.
  • Estimated Cost to Fix: $100 - $300+ per leak depending on location and labor.
  • Recalls: None Found
• Timing Belt and Water Pump Failure
  • Description/Symptoms: The VQ35DE is an interference engine. A worn or broken timing belt can cause significant engine damage. The water pump is often replaced simultaneously as preventative maintenance. Symptoms include engine ticking, misfires, and overheating.
  • Solution: Replace the timing belt, water pump, tensioners, and idler pulleys.
  • Estimated Cost to Fix: $500 - $1000+
  • Recalls: None Found
• Engine Mount Failure
  • Description/Symptoms: Worn engine mounts can cause excessive engine vibration, clunking noises, and rough shifting.
  • Solution: Replace the engine mounts.
  • Estimated Cost to Fix: $200 - $500+ depending on which mounts need replacement.
  • Recalls: None Found

Transmission

4-Speed Automatic Transmission

• Shifting Problems
  • Description/Symptoms: Transmission slipping, hard shifting, or failure to shift properly.
  • Solution: Could require a transmission flush, solenoid replacement, or a complete transmission rebuild or replacement.
  • Estimated Cost to Fix: $150 (flush) to $2,000+ (rebuild/replacement).
  • Recalls: None Found

Suspension

• Strut and Shock Absorber Failure
  • Description/Symptoms: Bouncy ride, poor handling, and excessive noise from the suspension.
  • Solution: Replace worn struts and shock absorbers.
  • Estimated Cost to Fix: $200 - $600+ per axle.
  • Recalls: None Found
• Ball Joint Failure
  • Description/Symptoms: Clunking or popping noises from the front suspension, loose steering, and uneven tire wear.
  • Solution: Replace worn ball joints.
  • Estimated Cost to Fix: $200 - $500+ per side.
  • Recalls: None Found
• Control Arm Bushing Wear
  • Description/Symptoms: Clunking noises, especially over bumps, and imprecise steering.
  • Solution: Replace worn control arm bushings or the entire control arm.
  • Estimated Cost to Fix: $150 - $400+ per arm, depending on whether bushings alone or the entire arm is replaced.
  • Recalls: None Found

Electrical

• Power Window Motor Failure
  • Description/Symptoms: Windows failing to go up or down, or only moving intermittently.
  • Solution: Replace the power window motor.
  • Estimated Cost to Fix: $150 - $300+ per window.
  • Recalls: None Found
• Alternator Failure
  • Description/Symptoms: Battery light on, dimming lights, and difficulty starting the vehicle.
  • Solution: Replace the alternator.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found
• Starter Failure
  • Description/Symptoms: Clicking noise when trying to start the car, failure to crank, or slow cranking.
  • Solution: Replace the starter.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found

Exterior

• Rust
  • Description/Symptoms: Rust forming on body panels, especially around the wheel wells, rocker panels, and undercarriage.
  • Solution: Repair or replace rusted panels.
  • Estimated Cost to Fix: Varies greatly depending on the severity and extent of the rust. $200+
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, leaking, or making unusual noises.
  • Solution: Diagnose and repair or replace the sunroof motor, track, or seals.
  • Estimated Cost to Fix: $100 - $500+ depending on the complexity of the repair.
  • Recalls: None Found
• Climate Control Issues
  • Description/Symptoms: AC blowing warm air, heater not working, or inconsistent temperature control.
  • Solution: Diagnose and repair or replace the AC compressor, heater core, blend door actuator, or other climate control components.
  • Estimated Cost to Fix: $100 - $800+ depending on the component.
  • Recalls: None Found

Summary

The 2002 INFINITI QX4, while generally a reliable vehicle, is prone to certain age-related issues. Engine oil leaks, timing belt/water pump maintenance, and suspension component wear are common. Electrical problems like window motor and alternator failures can also occur. The severity of these issues ranges from minor inconveniences to more costly repairs. Potential buyers should carefully inspect the vehicle and be prepared to address these potential problems. Cost of repair varies, and will likely be more expensive on an older vehicle.