VTC (Variable Timing Control) solenoid sludging / camshaft timing faults
high- Typically appears
- 80–150k mi
- Estimated repair
- $300 – $900
2001 INFINITI
QSedan
4.5L V8 (VK45DE) · Sedan
The 2001 Infiniti Q45 is the fourth-generation flagship sedan from Infiniti, Nissan's luxury division. It rides on a dedicated rear-wheel-drive platform and is powered by a 4.5-liter V8 producing 340 horsepower — one of the more potent luxury sedans of its era. The Q45 was Infiniti's answer to the BMW 7 Series and Mercedes S-Class, offering a blend of Japanese reliability engineering and genuine performance. By 2001, the Q45 had matured into a refined, driver-focused luxury sedan with a well-sorted suspension, a large and comfortable interior, and abundant standard equipment. It never achieved the sales volumes of its German rivals, which ironically makes well-kept examples relatively rare and often undervalued on the used market. At 20+ years old, a 2001 Q45 is squarely in enthusiast/collector territory. Parts availability is shrinking, dealer support is essentially gone, and finding a shop familiar with the platform takes effort. That said, owners who maintain these cars properly report strong longevity from the VK45DE engine.
Reliability
3/5
Verified data
Engine
4.5L V8 (VK45DE)
Drivetrain
RWD
Fuel
Gasoline
MPG
17 city / 24 hwy / 19 combined
Seats
5
Doors
4
Body
Sedan
MSRP
$51,700
Overview
AI-curatedThe 2001 Infiniti Q45 is the fourth-generation flagship sedan from Infiniti, Nissan's luxury division. It rides on a dedicated rear-wheel-drive platform and is powered by a 4.5-liter V8 producing 340 horsepower — one of the more potent luxury sedans of its era. The Q45 was Infiniti's answer to the BMW 7 Series and Mercedes S-Class, offering a blend of Japanese reliability engineering and genuine performance. By 2001, the Q45 had matured into a refined, driver-focused luxury sedan with a well-sorted suspension, a large and comfortable interior, and abundant standard equipment. It never achieved the sales volumes of its German rivals, which ironically makes well-kept examples relatively rare and often undervalued on the used market. At 20+ years old, a 2001 Q45 is squarely in enthusiast/collector territory. Parts availability is shrinking, dealer support is essentially gone, and finding a shop familiar with the platform takes effort. That said, owners who maintain these cars properly report strong longevity from the VK45DE engine.
Known for
- Potent 4.5L V8 with 340 hp — strong performance for the era
- Rear-wheel-drive platform with a sporting character
- Upscale, roomy cabin with high standard equipment levels
- Relatively understated styling compared to German competitors
- Strong long-term engine durability when properly maintained
Best for
- Enthusiasts who want a V8 luxury sedan at a fraction of its original price
- Owners comfortable sourcing parts independently or through specialty vendors
- Drivers who prioritize performance feel over brand prestige
- Those willing to invest in proper maintenance on an aging platform
Watch for
- Age-related rubber deterioration: hoses, belts, seals, and suspension bushings
- Shrinking parts availability — some components are dealer-only or discontinued
- High repair costs relative to current market value
- Complex electronics that can be difficult and expensive to diagnose
- Rust on underbody and brake lines common on Wisconsin/salt-belt cars
Common issues by mileage
6 knownOxygen / A/F sensor heater circuit failure
high- Typically appears
- 80–130k mi
- Estimated repair
- $200 – $600
Suspension bushing and ball joint wear
high- Typically appears
- 90–150k mi
- Estimated repair
- $600 – $2,000
Cooling system hose and thermostat failure
medium- Typically appears
- 100k+ mi
- Estimated repair
- $300 – $800
CAN bus / module communication faults
medium- Typically appears
- Any mileage on aging examples
- Estimated repair
- $200 – $1,500
Underbody rust — brake lines and fuel lines
high- Typically appears
- Any mileage on salt-belt cars
- Estimated repair
- $500 – $2,500
Maintenance schedule
- 1 Every 5,000 miles or 6 months Engine oil and filter change — use full synthetic 5W-30
The VK45DE's variable timing system is extremely sensitive to oil cleanliness. Sludge from extended intervals is the #1 cause of expensive camshaft timing repairs on this engine. Shorter intervals are cheap insurance.
- 2 Every 3 years, immediately if not done recently Coolant flush and hose inspection
Original hoses on a 2001 are 20+ years old. Coolant degrades and becomes corrosive. A cooling system failure on a V8 luxury sedan can cascade into a very expensive repair.
- 3 Every 30,000 miles Transmission fluid change
Infiniti's 5-speed automatic is durable but benefits from regular fluid changes, especially since fresh fluid is far cheaper than a transmission rebuild.
- 4 Every 2 years Brake fluid flush
Brake fluid absorbs moisture over time, lowering its boiling point and promoting internal corrosion. Critical on an older vehicle where calipers and wheel cylinders are already aging.
- 5 Every 60,000 miles or at first sign of clunking/vague handling Inspect and replace suspension bushings
The multi-link suspension delivers good handling when bushings are fresh but degrades noticeably as they age. Wisconsin freeze-thaw cycles accelerate rubber deterioration.
- 6 Every spring after winter season Inspect underbody — brake and fuel lines for rust
Road salt in Wisconsin causes accelerated corrosion on steel brake and fuel lines. Catching a pinhole before it becomes a failure is both safer and cheaper.
- 7 Every 30,000 miles or when camshaft timing codes appear Inspect and clean VTC oil control solenoids
Sludge accumulation in the VTC solenoids is a known failure mode. Cleaning or replacing them proactively avoids costlier timing chain and camshaft damage.
- 8 Every fall before winter Battery load test and terminal cleaning
A V8 luxury sedan draws significant cranking current. Cold Wisconsin winters expose a weak battery fast. Corroded terminals add resistance and can trigger phantom electrical faults on this car's aging electronics.
Always defer to the manufacturer's service manual for warranty-mandated intervals.
Cost of ownership
Annual maintenance
$1,200 – $3,500
Fuel
At ~19 MPG combined and a V8 requiring premium fuel, expect $2,200–$3,200/year at typical driving distances and current fuel prices.
Insurance
Typically moderate for a 20+ year old luxury sedan — market value is low, so comprehensive premiums are modest. Liability costs depend on your profile.
The Q45 was a $50k+ car when new and carries the repair complexity of that class, but today's used value is a fraction of that. Budget $1,200–$3,500/year for routine maintenance on a well-kept example; expect the higher end (or beyond) if deferred maintenance is being caught up on. Premium fuel, moderately poor fuel economy, and aging-specific repairs (bushings, hoses, sensors) are the main cost drivers. Parts for the VK45DE engine are still available but increasingly through specialty suppliers.
Seasonal care
Lake Geneva, WI Winter
- Test the battery every fall — a marginal battery will fail when temps drop below 10°F, and the V8's cold-cranking demand is high.
- Switch to full synthetic 5W-30 if not already in use; it flows faster at sub-zero temperatures and protects the VTC system on cold starts.
- Flush wiper fluid reservoir and fill with a -40°F-rated fluid; the standard reservoir is large and can freeze solid with the wrong mix.
- Inspect brake lines and fuel lines for rust and pitting before winter — salt will find any weakness and accelerate it dramatically.
- Check tire tread depth carefully; the RWD platform becomes genuinely challenging on ice and snow with worn tires. Snow tires are strongly recommended for Lake Geneva winters.
- Apply a fresh underbody rinse weekly during heavy salt-use periods, and flush the undercarriage thoroughly at the end of winter.
Summer
- Inspect the cooling system closely before summer — a 20+ year old car with original hoses is one hot day away from a roadside failure.
- Check A/C system charge and inspect the condenser for road debris; R-134a systems on vehicles this age often have slow leaks at aging seals.
- Adjust tire pressure to spec after temperatures rise — every 10°F of temperature increase raises tire pressure roughly 1 PSI.
- Inspect the serpentine belt and tensioner; heat accelerates rubber degradation on an already-old belt.
- Check power steering fluid condition — heat breaks down fluid faster and the rack seals on a car this age may already be weeping.
Comparable vehicles
2001 Lexus
LS 430
Direct Japanese luxury flagship competitor, similar V8 power and RWD character, typically better parts availability and arguably stronger reliability reputation at high mileage.
2001 BMW
7 Series
Same segment and mission, RWD V8 flagship. Driver-focused in a similar way, but significantly more expensive to repair and maintain at this age.
2001 Mercedes-Benz
S-Class
Directly competed with the Q45 when new. Comparable luxury and V8 power, but parts and repair costs are notably higher on aging W220-generation examples.
2001 Cadillac
DeVille
American flagship sedan of the same era, similar price point and comfort focus, easier parts sourcing domestically, though the Northstar V8 carries its own aging concerns.