"How reliable is the 2003 Infiniti I35?"

"Based on 134 NHTSA complaints, the 2003 Infiniti I35 has a median complaint mileage of 115000 miles. The most common issue is ENGINE."

"What are common problems with the 2003 Infiniti I35?"

"The most frequently reported component in NHTSA complaints for the 2003 Infiniti I35 is ENGINE, accounting for a significant portion of the 134 total complaints filed."

2003 Infiniti I35: Reliability Data

Source: NHTSA — 134 complaints

134

Total Complaints

115,000mi

Median Mileage

ENGINE

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

80,000 25th Percentile

115,000 Median Mileage

155,120 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

ENGINE

ENGINE AND ENGINE COOLING

ELECTRICAL SYSTEM

VEHICLE SPEED CONTROL

AIR BAGS

ELECTRONIC STABILITY CONTROL (ESC)

POWER TRAIN

UNKNOWN OR OTHER

ENGINE AND ENGINE COOLING:ENGINE

SERVICE BRAKES

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"WHILE DRIVING 30 MPH STEERING PULLED TO THE RIGHT. CONSUMER APPLYIED THE BRAKES, HOWEVER THE VEHICLE ACCELERATED. AS A RESULT, CONSUMER LOST CONTROL. NO IMPACT REPORTED. *AK"

"THE BRAKE PEDAL AND ACCELERATOR PEDAL ARE CLOSE TOGETHER. WITH MY SIZE 12 FOOT, IT IS EASY TO ACCIDENTALLY HAVE MY SHOE ON BOTH PEDALS. THE CAR HAS ENOUGH ENGINE POWER TO OVERCOME THE BRAKING SYSTEM, AND LEAD TO A COLLISION. WITH THE ABS AND TCS (TRACTION CONTROL SYSTEM) ON THIS CAR, I WOULD LIKE..."

"FOR THE LAST YEAR THE ENGINE OF MY 2003 INFINITI I35 HAS BEEN MAKING A NOISE UPON ACCELERATION (WHILE THE ENGINE IS UNDER STRESS) ESPECIALLY ON INCLINES. I HAVE BROUGHT THE VEHICLE TO PEPE INFINITI, THEY'VE DUPLICATED THE NOISE, YET THEY HAVEN'T DONE ANYTHING TO RECTIFY THE PROBLEM ALTHOUGH THE VEH..."

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28