Bradley, I just performed a closed throttle decal test and here are the results: Test 1: Nox 1= 8; Nox 2= 57. Test 2: Nox 1= 3; Nox 2= 45. If the aler result that I had of 1.1:1 is of no concern, then it looks like Nox sensor 2 is my problem. Thank you in adva... Login to read more.