Hello, I've got a problem with my 02 sensonr, fuel pressure regulator, and the catylitic converter or muffler. I have called chevrolet and they could not even tell me if this is covered under the 8 year 80,000 mile warranty. My truck is 04 trailblazer 4x4 72k miles. Do any of you out there know? I have also called service advisor after service advisor and they couldn't tell me, these parts are all listed under emisions related warranty parts in my warranty booklet, but I don't know if it is covered or not. Any help is appreciated.