The 2007 Infiniti G35x, the all-wheel-drive variant of Infiniti’s G35 line, is generally regarded as reliable for its class, but owners frequently report a set of age-related issues. The most common problems involve the automatic transmission and AWD drivetrain, engine misfires related to ignition components, cooling and gasket wear, electrical/sensor glitches, and suspension wear. This article outlines those issues, what causes them, and how buyers or owners might address them.
Transmission and AWD drivetrain issues
The G35x uses a 5-speed automatic transmission paired with an all-wheel-drive system. With mileage, several wear items can surface, affecting shifting feel, engagement, and overall reliability.
- Shifting that is harsh, clunky, or feels delayed, especially between gears
- Delayed engagement when selecting Drive or reverse, or brief limp-like behavior
- Torque converter shudder or slipping during acceleration
- AWD transfer case or driveshaft wear leading to whining, vibrations, or noise at speed
- Transmission fluid leaks or external seals showing signs of seepage
- In rare cases, transmission failure that requires rebuilding or replacement
Regular fluid checks and servicing, along with addressing symptoms early, can prolong transmission life. Severe or persistent issues often require professional diagnosis and, potentially, a substantial repair cost.
Engine and fuel system issues
The VQ35DE engine that powers the G35x is known for durability, but older examples accumulate wear items that affect performance and reliability.
- Ignition coil packs or spark plugs failing, causing misfires and rough running
- Oil consumption or minor oil leaks from valve covers or gaskets
- Valve cover gasket leaks, oil pooling around the edges of the engine
- Timing chain tensioner/guide wear in high-mileage engines, leading to a rattling sound on startup or idle
- Fuel injectors clogging or failing, contributing to rough idle or reduced efficiency
Addressing ignition and sealing wear promptly—plus keeping up with recommended oil changes and using quality fuel—can minimize engine-related problems. In older engines, a timing chain or tensioner issue is more costly to repair if left unresolved.
Electrical and interior issues
- Wheel-speed/ABS sensors failing or wiring wear, triggering ABS/traction control warnings
- Dashboard or instrument cluster dimming, flickering lights, or failing gauges
- Power window regulators or motors failing, causing slow or stalled windows
- Sunroof drainage clogs causing water intrusion and interior moisture or odors
- Airbag recall-related sensors or occupant detection issues that may require dealer service (recall history varies by VIN)
Electrical concerns often improve with module resets or replacements, but persistent faults can be costly and may require a dealer or specialty shop diagnosis.
Suspension, steering, and braking wear
Aging suspension components on the G35x can affect ride quality, handling, and braking performance.
- Worn or cracked bushings (notably rear control arm bushings) causing clunking or poor alignment
- Worn wheel bearings or hub assemblies producing rumble or play
- Brake rotor warping or caliper sticking leading to pulsation or uneven braking
- Steering rack seals or power steering pump wear leaking or producing noise
- Overall suspension wear contributing to uneven tire wear or reduced handling precision
Regular inspection of the suspension and braking system can prevent costly misalignment or safety issues. Replacing worn components as needed helps maintain confidence in cornering and braking performance.
Maintenance considerations and buying tips
For prospective buyers or owners seeking to extend life, understanding maintenance history and current condition is essential. The following checks summarize what to look for in a used 2007 G35x.
- Service history, especially transmission fluid changes and any prior transmission work
- Evidence of ignition system maintenance: coil packs and spark plugs replacement intervals
- Oil consumption history and any signs of valve cover gasket leaks or other seals
- Cooling system condition: radiator hoses, water pump, thermostat housing, and coolant leaks
- Comprehensive inspection of suspension components, bushings, wheel bearings, and brakes
- Check for recall campaigns and ensure any open recalls have been completed (VIN-specific)
- Pre-purchase or routine maintenance inspections by a qualified Infiniti technician or trusted shop
Because this model is aging, a thorough inspection and a clear maintenance record are more telling than mileage alone. An informed buyer can negotiate repairs or price accordingly and plan for likely maintenance needs.
Summary
The 2007 Infiniti G35x remains a compelling, performance-oriented luxury sedan, but its AWD drivetrain, VQ35DE engine, electrical systems, and suspension components show typical wear with higher mileage. The most common problems fall into four categories: transmission/AWD issues, engine and fuel-system wear, electrical and interior faults, and suspension/braking wear. Early detection, proactive maintenance, and a detailed pre-purchase inspection can significantly reduce the risk of unexpected repair costs and help owners keep the G35x on the road longer.