The 2003 Infiniti I35, produced from 2002 to 2004, was a mid-size luxury sedan based on the Nissan Maxima platform. Slotting above the G sedan, it was Infiniti's answer to comfortable, upscale daily driving. Key trims typically included a base model and a more premium option. Popular for its blend of V6 power, refined interior, and a more understated luxury than some competitors, it offered a compelling value proposition.
The Good
The 2003 Infiniti I35 shines with its potent V6 performance and a remarkably smooth, comfortable ride. Its refined interior appeals to emotional desires for luxury, while practical buyers appreciate its solid reliability and good value for a premium sedan.
The Bad
Owners of the 2003 Infiniti I35 should be aware of potential issues like transmission problems, particularly in earlier models. Also, keep an eye out for electrical glitches, HVAC system failures, and the possibility of oil leaks or coolant issues.
2003 Infiniti I35: Quick Overview
- Engine Options: The 2003 Infiniti I35 exclusively featured a 3.5-liter VQ35DE V6 engine.
- Horsepower: This V6 produced a healthy 255 horsepower at 6,400 rpm.
- Torque: It delivered 246 lb-ft of torque at 4,400 rpm.
- Transmission: Primarily paired with a 4-speed automatic transmission. A 6-speed manual was available on the Nissan Maxima sibling, but not commonly found or offered on the I35.
- Fuel Economy: Estimated EPA ratings were around 18 mpg city / 25 mpg highway.
- 0-60 Times: Typically clocked in the mid to high 6-second range, offering brisk acceleration.
- Towing Capacity: Not designed or equipped for towing.
- Trim-Level Features (Base I35):
- Leather upholstery
- Power-adjustable front seats
- Automatic climate control
- Bose premium audio system
- Steering wheel-mounted audio controls
- Keyless entry
- Power windows, locks, and mirrors
- Cruise control
- Xenon HID headlights
- Optional Features:
- Sunroof
- Heated front seats
- Navigation system
- Premium floor mats
- Body side moldings
- Suspension: Independent front and rear suspension for a comfortable and composed ride.
- Brakes: Four-wheel disc brakes with ABS.
2003 Infiniti I35 Specifications
Vehicle Information
| Year | 2003 |
| Make | Infiniti |
| Model | I35 |
| Trim | - |
| Style | - |
| Type | Sedan |
| Category | Compact Car |
Manufacturing Details
| Made In | Japan |
| Manufacturing City | SMYRNA |
Dimensions
| Doors | 4-Door |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 3.5 L V-6 |
| Engine Size | 3.5L |
| Engine Cylinders | 6 |
| Transmission | - |
| Transmission Type | - |
| Transmission Speeds | - |
| Drivetrain | Front-Wheel Drive |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
Vehicle History Report
Vehicle
Specifications
Specifications
Ownership
History
History
All History
Events
Events
NMVTIS Title
History Check
History Check
Salvage/Rebuilt
Check
Check
Accident
Check
Check
Theft
Check
Check
Open Lien
Check
Check
Past Sale
Listings
Listings
Safety
Recalls
Recalls
Odometer
Check
Check
Market Price
Analysis
Analysis
What Problems Does the 2003 Infiniti I35 Have?
The 2003 Infiniti I35, while generally considered a reliable luxury sedan, does have a few common issues that owners should be aware of. One of the more frequently reported problems revolves around the transmission. While not as widespread as some other makes, there are instances of premature failure or rough shifting, particularly with higher mileage examples. This often stems from the 4-speed automatic transmission needing service or fluid changes.
Another area of concern can be the HVAC system. Issues such as a malfunctioning blower motor, clogged evaporator cores, or problems with the blend door actuators can lead to poor heating or cooling performance. These can be costly repairs if not addressed promptly.
Electrical gremlins are also sometimes mentioned, including issues with power windows, door locks, and the infotainment system. These can range from minor annoyances to more significant electrical faults.
Oil leaks, particularly from the valve covers or oil pan gasket, are not uncommon as the vehicle ages and mileage increases. Similarly, coolant leaks, often from hoses or the radiator, can occur and should be monitored to prevent overheating.
Regarding recalls, the 2003 model year had a few, primarily related to potential issues with the occupant classification system (affecting airbag deployment in certain scenarios) and potentially some minor issues with the fuel system. It's always advisable to check for any outstanding recalls with Infiniti.
Long-term reliability is generally good if the vehicle has been meticulously maintained. The VQ35DE engine itself is robust, but like any engine, it requires regular oil changes and proper cooling system maintenance to avoid long-term stress.
Another area of concern can be the HVAC system. Issues such as a malfunctioning blower motor, clogged evaporator cores, or problems with the blend door actuators can lead to poor heating or cooling performance. These can be costly repairs if not addressed promptly.
Electrical gremlins are also sometimes mentioned, including issues with power windows, door locks, and the infotainment system. These can range from minor annoyances to more significant electrical faults.
Oil leaks, particularly from the valve covers or oil pan gasket, are not uncommon as the vehicle ages and mileage increases. Similarly, coolant leaks, often from hoses or the radiator, can occur and should be monitored to prevent overheating.
Regarding recalls, the 2003 model year had a few, primarily related to potential issues with the occupant classification system (affecting airbag deployment in certain scenarios) and potentially some minor issues with the fuel system. It's always advisable to check for any outstanding recalls with Infiniti.
Long-term reliability is generally good if the vehicle has been meticulously maintained. The VQ35DE engine itself is robust, but like any engine, it requires regular oil changes and proper cooling system maintenance to avoid long-term stress.
How long will the 2003 Infiniti I35 last?
The 2003 Infiniti I35 is known for its potential for long-term durability, with many owners reporting reaching or exceeding 200,000 miles with proper care. This longevity is a testament to the robust VQ35DE V6 engine. However, weaknesses that tend to appear over time include the aforementioned transmission concerns, HVAC system components, and potential for oil/coolant leaks. Consistent and proactive maintenance, including regular fluid changes (engine oil, transmission fluid, coolant) and timely replacement of wear items like belts and hoses, is crucial to maximizing its service life. Neglecting maintenance will accelerate the appearance of these weaknesses, potentially leading to more significant and expensive repairs.
What Technology & Safety Features are Included?
The 2003 Infiniti I35 offered a respectable suite of technology and safety features for its era, aiming to provide a premium experience. Standard entertainment included a Bose audio system, which was a notable upgrade for many vehicles at the time, often featuring multiple speakers and a cassette/CD player. Some models might have had an optional in-dash navigation system, a cutting-edge feature for 2003.
In terms of driver-assistance features, the I35 was relatively basic by today's standards. It typically came equipped with cruise control and power accessories. Advanced driver-assistance systems like adaptive cruise control, lane departure warning, or blind-spot monitoring were not available.
Safety was a priority, with standard features like anti-lock brakes (ABS) and front and side-impact airbags. Some models may have offered optional traction control.
Crash-test ratings for the 2003 Infiniti I35 (which shared its platform with the Nissan Maxima) generally indicated good performance for its time. The National Highway Traffic Safety Administration (NHTSA) awarded it four out of five stars for frontal driver and passenger crash protection. Side-impact protection ratings were also generally favorable, typically receiving four stars for the front and rear passenger. The Insurance Institute for Highway Safety (IIHS) also rated it well in its frontal offset crash tests.
Overall, the tech and safety features provided a solid foundation for a luxury sedan, focusing on core conveniences and essential safety, rather than the extensive digital integration and advanced driver aids found in modern vehicles.
In terms of driver-assistance features, the I35 was relatively basic by today's standards. It typically came equipped with cruise control and power accessories. Advanced driver-assistance systems like adaptive cruise control, lane departure warning, or blind-spot monitoring were not available.
Safety was a priority, with standard features like anti-lock brakes (ABS) and front and side-impact airbags. Some models may have offered optional traction control.
Crash-test ratings for the 2003 Infiniti I35 (which shared its platform with the Nissan Maxima) generally indicated good performance for its time. The National Highway Traffic Safety Administration (NHTSA) awarded it four out of five stars for frontal driver and passenger crash protection. Side-impact protection ratings were also generally favorable, typically receiving four stars for the front and rear passenger. The Insurance Institute for Highway Safety (IIHS) also rated it well in its frontal offset crash tests.
Overall, the tech and safety features provided a solid foundation for a luxury sedan, focusing on core conveniences and essential safety, rather than the extensive digital integration and advanced driver aids found in modern vehicles.
What Colors Options are Available?
We’re working on this section!
In the meantime, feel free to explore the other sections for more content.
In the meantime, feel free to explore the other sections for more content.
2003 Infiniti I35 Prices and Market Value
When new, the 2003 Infiniti I35 had an original MSRP that typically ranged from around $33,000 to $38,000, depending on the trim level and optional equipment. As is typical for luxury vehicles, it experienced significant depreciation in its early years. Today, used prices for a 2003 Infiniti I35 can range widely, from approximately $2,000 to $6,000, heavily influenced by mileage, condition, maintenance history, and trim level. Factors affecting resale value include overall condition, the presence of major mechanical issues (especially transmission problems), and the vehicle's maintenance records. Well-maintained examples with lower mileage will command higher prices, while those with deferred maintenance or high mileage will be at the lower end of the spectrum.
2003 Infiniti I35 Cost of Ownership
Owning a 2003 Infiniti I35 can be considered moderately costly, especially as it ages. Insurance premiums will likely be higher than for a mainstream sedan due to its luxury classification. Fuel costs are reasonable for its class, with its V6 engine offering decent highway economy, but city driving will consume more. Routine maintenance, like oil changes and tire rotations, is comparable to other mid-size sedans. However, repair costs can escalate, particularly if major components like the transmission or HVAC system require attention. While initially offering good value, long-term ownership costs can become significant if unforeseen repairs arise, making it less economical than a comparable, newer non-luxury vehicle.
2003 Infiniti I35 Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
2003 Infiniti I35 Safety Rating
NHTSA
2003 Infiniti I35 Insurance
Insurance for a 2003 Infiniti I35 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 I35 Compare to Other Sedan?
The 2003 Infiniti I35 competed in the mid-size luxury sedan segment against formidable rivals. In terms of performance, its 255-hp V6 provided brisk acceleration, often outperforming competitors like the entry-level Lexus ES 330 or the Acura TL of the same era, which might have offered slightly less horsepower. The I35's ride was tuned for comfort, leaning more towards a plush experience than the sportier handling of some rivals.
Regarding features, the I35 offered a good balance of luxury appointments like leather seats and a premium Bose audio system. However, competitors like the BMW 3 Series or Mercedes-Benz C-Class (though often at a higher price point) might have offered more advanced tech or a more prestigious badge. The Lexus ES 330 was a strong contender in comfort and quietness.
Reliability is a mixed bag. While the Infiniti VQ engine is generally robust, the I35 had a reputation for potential transmission issues, which was a concern compared to the stellar reliability reputation of Lexus vehicles. Acura also generally held a strong reliability record.
In terms of price, the I35 offered a compelling value proposition, often being priced more competitively than its German counterparts and sometimes the Lexus ES. It provided a near-luxury experience at a more accessible price point.
Similar Alternatives:
Better Alternatives (depending on priorities): If absolute reliability is the top priority, a Lexus ES 330 is a safer bet. If a more engaging driving experience is desired, an Acura TL might be preferred. The I35 sits in a good middle ground for those seeking strong V6 power and a comfortable ride without the highest luxury price tag, provided potential transmission issues are addressed.
Regarding features, the I35 offered a good balance of luxury appointments like leather seats and a premium Bose audio system. However, competitors like the BMW 3 Series or Mercedes-Benz C-Class (though often at a higher price point) might have offered more advanced tech or a more prestigious badge. The Lexus ES 330 was a strong contender in comfort and quietness.
Reliability is a mixed bag. While the Infiniti VQ engine is generally robust, the I35 had a reputation for potential transmission issues, which was a concern compared to the stellar reliability reputation of Lexus vehicles. Acura also generally held a strong reliability record.
In terms of price, the I35 offered a compelling value proposition, often being priced more competitively than its German counterparts and sometimes the Lexus ES. It provided a near-luxury experience at a more accessible price point.
Similar Alternatives:
- Lexus ES 330 (2004-2006): Known for exceptional reliability, supreme comfort, and a quiet ride. Performance is more sedate than the I35.
- Acura TL (2004-2008): Offers a sportier driving dynamic, good performance, and strong reliability, though often at a slightly higher price point.
- Buick Park Avenue Ultra: If comfort and a smooth ride are paramount, the Park Avenue Ultra offered a large, comfortable cabin and supercharged V6 power, though it lacked the refined handling of the I35.
Better Alternatives (depending on priorities): If absolute reliability is the top priority, a Lexus ES 330 is a safer bet. If a more engaging driving experience is desired, an Acura TL might be preferred. The I35 sits in a good middle ground for those seeking strong V6 power and a comfortable ride without the highest luxury price tag, provided potential transmission issues are addressed.
Final Verdict: Is the 2003 Infiniti I35 a Good Sedan?
The 2003 Infiniti I35 is ideal for a budget-conscious buyer seeking a comfortable and well-equipped mid-size luxury sedan with a potent V6 engine. It's particularly suited for those who prioritize a smooth ride and a refined interior over cutting-edge technology or sporty handling.
Whether it's worth buying largely depends on its condition and price. As a used vehicle, it can offer excellent value if found in good repair, especially if major issues like transmission problems have been addressed or are not present.
It is definitely worth buying used, not new, given its age. Look for well-maintained examples with documented service history. Trims with premium packages can enhance the ownership experience. However, prospective buyers should be prepared for potentially higher repair costs compared to more mainstream vehicles, especially concerning the transmission and HVAC systems. A thorough pre-purchase inspection is highly recommended.
Whether it's worth buying largely depends on its condition and price. As a used vehicle, it can offer excellent value if found in good repair, especially if major issues like transmission problems have been addressed or are not present.
It is definitely worth buying used, not new, given its age. Look for well-maintained examples with documented service history. Trims with premium packages can enhance the ownership experience. However, prospective buyers should be prepared for potentially higher repair costs compared to more mainstream vehicles, especially concerning the transmission and HVAC systems. A thorough pre-purchase inspection is highly recommended.
Simon A
Simon is a contributor to VinCheck, where he provides articles and reviews on various automotive topics. His work focuses on delivering accurate and up-to-date information about used cars, helping readers make informed decisions.