One problem related to emission control has been reported for the 2003 Infiniti I35. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Infiniti I35 based on all problems reported for the 2003 I35.
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 vehicle is still under the manufacturer's warranty. I have contacted the Infiniti corporate office to no avail. I am filing a complaint to hopefully get some resolution regarding this matter.