The 2003 Infiniti Q45 was a flagship luxury sedan produced from 1990 to 2006, with the 2003 model representing the second generation. This model year featured a sleek, four-door sedan body style. Key trims were generally synonymous with the base model, often enhanced by optional packages. Its popularity stemmed from offering a compelling blend of powerful V8 performance, upscale amenities, and a refined driving experience, often at a more competitive price point than German rivals.
The Good
The 2003 Q45 boasts a potent V8 engine for exhilarating performance, a comfortable and quiet cabin for a serene ride, and elegant styling that turns heads. Its strong value proposition makes it an emotionally satisfying and practically sound choice for luxury seekers.
The Bad
Potential owners should be aware of common issues like electrical gremlins, transmission problems, and suspension wear. Fuel economy is also not a strong suit, and some interior materials might show age. Regular maintenance is crucial to mitigate these concerns.
2003 Infiniti Q45: Quick Overview
- Engine Options: The 2003 Infiniti Q45 exclusively featured a 4.5-liter V8 engine.
- Horsepower: This V8 produced 340 horsepower.
- Torque: It delivered 333 lb-ft of torque.
- Transmission: A 5-speed automatic transmission was standard.
- Drivetrain: Rear-wheel drive was standard; all-wheel drive was optional.
- Fuel Economy: EPA estimated fuel economy was around 17 MPG city and 22 MPG highway.
- 0-60 Times: Acceleration from 0 to 60 mph was typically in the mid to high 5-second range, demonstrating strong performance for its class.
- Towing Capacity: The Q45 was not designed or rated for towing.
- Key Trim/Features: The 2003 Q45 was offered in a single primary trim level, but it came loaded with standard luxury features. Optional packages added further amenities. Standard features often included leather upholstery, heated and power-adjustable front seats, a power moonroof, dual-zone automatic climate control, a premium Bose audio system with a CD player, xenon headlights, and keyless entry with push-button start. Optional features could include a navigation system, a rearview camera, and upgraded audio components. The vehicle also prioritized comfort with features like a smooth suspension and a quiet cabin.
2003 Infiniti Q45 Specifications
Vehicle Information
| Year | 2003 |
| Make | Infiniti |
| Model | Q45 |
| Trim | - |
| Style | - |
| Type | Sedan |
| Category | Compact Car |
Manufacturing Details
| Made In | Japan |
| Manufacturing City | SAMUKAWA |
Dimensions
| Doors | 4-Door |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | VK45DE |
| Engine Size | 4.5L |
| Engine Cylinders | 8 |
| Transmission | 5-Speed Automatic |
| Transmission Type | Automatic |
| Transmission Speeds | 5-Speed |
| Drivetrain | Rear-Wheel Drive |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
Vehicle History Report
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Analysis
Analysis
What Problems Does the 2003 Infiniti Q45 Have?
The 2003 Infiniti Q45, while generally considered a capable luxury sedan, is not without its known issues. Owners have frequently reported problems related to the vehicle's electrical system. This can manifest as intermittent warning lights, malfunctioning gauges, or issues with power accessories. Another common area of concern is the transmission; some owners have experienced rough shifting, premature wear, or complete failure, often requiring costly repairs or replacement. The suspension is another component that can require attention over time, with reports of worn ball joints, control arm bushings, and strut issues leading to noises or degraded ride quality. Some model years have seen specific issues, although for the 2003 model year, the electrical and transmission concerns are more prevalent across its production run. While there haven't been widespread, major recalls that crippled the model, individual owners may encounter issues with catalytic converters, fuel pumps, or ignition coils. Long-term reliability can be impacted by the complexity of its advanced features, particularly in older vehicles where electronic components can degrade. A thorough pre-purchase inspection by a mechanic familiar with luxury Japanese vehicles is highly recommended for any prospective buyer to identify potential upcoming repairs. Regular and diligent maintenance is key to mitigating some of these long-term reliability concerns and ensuring the Q45 remains a dependable vehicle.
How long will the 2003 Infiniti Q45 last?
Based on owner data and typical maintenance habits, a well-maintained 2003 Infiniti Q45 can reliably serve for 150,000 to 200,000 miles, and in some cases, even more. This indicates a respectable level of long-term durability inherent in its V8 powertrain and overall construction. However, reaching these higher mileage figures hinges significantly on consistent and proactive maintenance. Weaknesses that tend to emerge over time include potential electrical component failures and wear within the transmission, as previously noted. Suspension components also require periodic attention. Neglecting routine service, especially fluid changes for the engine and transmission, can accelerate wear and lead to more significant, costly repairs, thereby shortening its overall lifespan. Owners who prioritize regular servicing and address minor issues promptly are more likely to experience the Q45's full potential for longevity.
What Technology & Safety Features are Included?
The 2003 Infiniti Q45 was equipped with a suite of technology and safety features befitting a luxury sedan of its era, aiming to provide both convenience and security. Standard technology included a sophisticated Bose audio system, often with an in-dash CD player and an impressive number of speakers designed for rich sound quality. A power moonroof was also a common feature, adding an open-air feel to the cabin. For convenience, the Q45 featured keyless entry and a push-button start system, which was quite advanced for its time. Dual-zone automatic climate control ensured personalized comfort for both driver and front passenger. When it came to driver assistance, the 2003 Q45 offered an optional navigation system, a premium feature that was a significant technological upgrade for many buyers. An optional rearview camera also aided in parking and reversing. Safety was addressed through standard front and side-impact airbags. Antilock brakes (ABS) and electronic brake-force distribution (EBD) were also standard. Traction control and stability control systems further enhanced driver confidence, especially in adverse conditions. While specific crash-test ratings for the 2003 model year from organizations like the NHTSA or IIHS can be difficult to find for older vehicles, luxury sedans of this caliber generally performed well in their respective testing protocols, emphasizing structural integrity and occupant protection. The overall tech package, while not as integrated as modern systems, offered a luxurious and technologically advanced experience for its time.
What Colors Options are Available?
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In the meantime, feel free to explore the other sections for more content.
2003 Infiniti Q45 Prices and Market Value
When new, the 2003 Infiniti Q45 carried a Manufacturer's Suggested Retail Price (MSRP) that typically started in the high $50,000s and could easily climb into the $60,000s with optional packages. As with most luxury vehicles, the Q45 experienced significant depreciation in its early years. Currently, on the used market, prices for a 2003 Q45 can range broadly from around $3,000 to $8,000, heavily depending on mileage, condition, and trim level. Factors significantly affecting its resale value include its maintenance history, the presence of any outstanding mechanical issues (especially transmission or electrical), and overall cosmetic condition. A well-maintained example with lower mileage will command a higher price. The Q45's value is also influenced by its reputation for strong V8 performance and luxury, which continues to attract enthusiasts seeking a premium experience at a budget-friendly price point.
2003 Infiniti Q45 Cost of Ownership
Owning a 2003 Infiniti Q45 is generally considered costly, especially when factoring in all expenses. Insurance premiums can be higher due to its luxury classification and V8 engine. Fuel costs are significant, with its relatively poor fuel economy demanding frequent stops at the pump. Maintenance, while potentially manageable for routine items, can become expensive due to specialized parts and the labor required for complex systems. Repair costs, particularly for the transmission and electrical components, can be substantial. While the initial purchase price of a used Q45 might be attractive, its long-term ownership costs lean towards the higher end of the spectrum, making it less economical than many other vehicles.
2003 Infiniti Q45 Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
18 gallons
City Mileage
17 miles/gallon
Highway Mileage
25 miles/gallon
2003 Infiniti Q45 Safety Rating
NHTSA
2003 Infiniti Q45 Insurance
Insurance for a 2003 Infiniti Q45 is moderately priced, reflecting its status as a Sedan with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2003 Infiniti Q45 Compare to Other Sedan?
The 2003 Infiniti Q45 competed in a highly contested luxury sedan segment against formidable rivals like the Lexus LS 430, BMW 7 Series (E65), and Mercedes-Benz S-Class (W220). In terms of performance, the Q45's 340-horsepower V8 offered strong acceleration and a powerful driving experience, often rivaling or even exceeding the base engines of its competitors. The Lexus LS 430, while also smooth and powerful, often focused more on serene comfort than outright performance. The German rivals, BMW and Mercedes, offered more potent engine options in their higher trims but at a significantly higher price point. When it came to features, the Q45 was well-appointed with luxury amenities, including leather, premium audio, and advanced tech for its era. However, the German luxury sedans often offered more cutting-edge technology and a wider array of optional features, especially in terms of driver assistance and sophisticated infotainment systems. Reliability is where the Q45 faced challenges compared to its Japanese counterpart. The Lexus LS 430 is renowned for its exceptional long-term reliability and bulletproof engineering. While the BMW and Mercedes offered refined driving dynamics, they were also known for higher maintenance and repair costs, and sometimes questionable reliability, particularly in their early years of a new generation. Price-wise, the Q45 typically offered a significant value proposition. It provided a luxurious experience and strong performance at a lower price point than its German competitors, and often even the Lexus. Similar alternatives that offer a blend of luxury and performance at a comparable used price might include a well-maintained Cadillac DeVille DTS (for comfort and V8 power) or potentially an earlier generation Audi A8 if one prioritizes quattro all-wheel drive and refined German engineering, though reliability might be a concern. However, for a balance of V8 power, luxury, and relative affordability on the used market, the 2003 Infiniti Q45 remains a compelling, albeit sometimes mechanically demanding, choice.
Final Verdict: Is the 2003 Infiniti Q45 a Good Sedan?
The 2003 Infiniti Q45 is ideal for the discerning buyer seeking a powerful, luxurious sedan with a strong V8 engine at a significantly reduced price on the used market. It's best suited for individuals who appreciate a refined driving experience and a comfortable, well-equipped cabin without the hefty price tag of newer luxury vehicles. It is absolutely worth buying, but only under specific conditions. Prospective buyers should focus exclusively on the used market, as a new Q45 is no longer available. A thorough pre-purchase inspection by a mechanic specializing in Infiniti or Nissan vehicles is non-negotiable. Buyers should be prepared for potentially higher maintenance and repair costs than more common vehicles, particularly concerning the transmission and electronics. If you prioritize performance and luxury on a budget and are willing to invest in diligent maintenance and occasional repairs, the 2003 Q45 can be a rewarding ownership experience.
Cathleen V
Cathleen is an exceptional freelance writer covering hot topics in the automotive world from a gearhead's perspective. Her articles delve into various aspects of automotive technology and history, offering readers detailed insights into engine performance, reliability, and maintenance. Through her engaging and informative writing, Cathleen provides valuable information to automotive enthusiasts and consumers alike, helping them make informed decisions about vehicle maintenance and purchases.