I will just say that I personally own a few Z at this present time and have owned more than a few over my run with just the Z32's, no to mention countless local guys that I have worked on there Zs and maybe one or two I have ever seen where the check engine light comes on. I have even been in a buddies car while he was showing off and his timing belt broke, needless to say it didn't turn out so good but no check engine light came on. Broken ring on piston cause slight miss no check engine light. If your check engine like comes on then you have a really bad problem. The one time I can think of it possible coming on was when all the lights came on ABS, started/ drove a Z without battery using a charger!