Quick update to this thread. I took it to the dealership, like I posted earlier ,and they cleared all the codes and told me my sensors were fine when they were tested. That same day I got my stillen headers installed. It's been a week now with no SES light issues, and I've driven to Vegas and back so it definetly should have tripped. I don't know if it was the headers that fixed the problem or what. It's either the headers, or the following: The Infiniti tech that looked at the car told me something like this, the car does what is called an "A/F ratio self learning" or something. When I had the other exhaust parts installed it didn't match the initial readings. Thats why it takes a drive cycle for the sensors to realize the readings are different from the "learned" values and signal the ECU to trip the SES. Resetting the ECU won't clear the old A/F ratio values. So he cleared what he called the "mixture ratio self-learning value" the car had and let it learn the higher flow. I think this is what cleared my issues up. I'll never know for sure because I made the choice to go ahead with the headers install. Either way, I'm back on the road and didn't have to spend a dime to fix any sensors booyahh!!!

 

nice nice... ^