What breaks most · 2001 to 2004 model years
Infiniti I35 problems by year
Owners have filed 200 safety complaints with NHTSA about the Infiniti I35 across model years 2001 to 2004. Three years stand out: 2003 for engine complaints, 2002 for engine and cooling complaints and 2004 for air bags complaints.
- Years to check closely: 2003, 2002, 2004
- Complaints on file
- 2002001 to 2004, all trims
- Worst year
- 200393 complaints
- Crashes reported
- 132 fires · 15 injuries · 11 deaths
- Typical failure mileage
- 101kMedian where owners gave mileage
- Recall campaigns
- 15Across the years shown
Complaints by model year
Raw filings with NHTSA, not adjusted for how many were sold.
| Model year | Complaints | Crashes | Recalls | Most-reported component |
|---|---|---|---|---|
| 2 | 0 | 2 | Powertrain and transmission (1) | |
| 70 | 11 | 5 | Engine and cooling (14) | |
| 93 | 2 | 5 | Engine (44) | |
| 35 | 0 | 3 | Air bags (12) |
What fails on the 2003 Infiniti I35
| Component | Share of complaints | Filings | Crashes | Parts for this job |
|---|---|---|---|---|
| EngineEngine gaskets and seals | 47% |
44 | 0 | Shop engine parts for the 2003 Infiniti I35 |
| Engine and coolingRadiators, thermostats and cooling | 29% |
27 | 0 | Shop engine and cooling parts for the 2003 Infiniti I35 |
| Electrical systemAlternators, starters and ignition | 14% |
13 | 0 | Shop electrical system parts for the 2003 Infiniti I35 |
| Speed control and throttleThrottle and pedal sensors | 11% |
10 | 0 | Shop speed control and throttle parts for the 2003 Infiniti I35 |
| Stability controlABS and wheel speed sensors | 9% |
8 | 0 | Shop stability control parts for the 2003 Infiniti I35 |
| Air bags | 9% |
8 | 0 | Check recalls for air bags on NHTSA.gov |
| Powertrain and transmissionTransmission parts | 5% |
5 | 0 | Shop all powertrain and transmission parts, not filtered to this vehicle |
| Unknown or other | 5% |
5 | 0 | — |
One complaint can name more than one component, so shares add to more than 100%. "Unknown or other" is NHTSA's uncategorized bucket and is shown but never ranked.
In owners' words
Complaint narratives as filed with NHTSA, trimmed for length.
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2003 infinity i35 stalls/dies without warning, spits/jerks forward, check engine light, tcs and slip. Happens while driving but usually starts right back up afterwards. Has happened a number of times have replaced one camshaft position sensor and still have the same issue.
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While driving at approximately 5-10mph and when turning left vehicle stalled. Consumer took the vehicle to the dealer, who stated that the problem could not be duplicated or resolved. *ak *nm
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Driving at 10 mph, the accelerator no longer revs up the engine. The engine stays at idle speed only. No lights on dashboard. I put it in neutral, and engine revs up. I turn it off and let it sit for 15 - 30 minutes and it drives fine.
How to read this page
Every figure comes from the National Highway Traffic Safety Administration's public complaint database, which holds every safety-related defect complaint filed by owners since 1995. We refresh it monthly and count each complaint once per component it names. Data through September 6, 2026.
NHTSA only accepts safety-related complaints. Rattles, paint, infotainment bugs and other annoyances are under-reported here, so this page is a map of what fails in ways owners consider dangerous, not a full reliability score.
Counts are raw. Use the year-over-year shape and the component mix, not the absolute numbers. Where a component maps to parts we stock, the row links to that category filtered to the year you are viewing. Air bag and seat belt complaints link to the recall checker instead, because those repairs are almost always covered.
Common questions
Which Infiniti I35 years have the most problems?
By NHTSA complaint volume, 2003, 2002, 2004 carry the most filings on the Infiniti I35. The 2003 alone has 93 complaints, led by engine.
What is the most common Infiniti I35 problem?
On the 2003 model year, the most-reported component is engine with 44 complaints. The table above lists the top components for every year.
At what mileage do Infiniti I35 problems start?
The median mileage at failure across all Infiniti I35 complaints that include mileage is about 101,000 miles. Older model years skew higher; the per-year figure is in the "at a glance" card.
Are these complaints verified?
No. NHTSA publishes complaints as submitted and does not investigate individual filings. Patterns across hundreds of complaints are meaningful; a single one is not.