I'm not so much worried about emissions, they're non-existent where I live, I just want to keep the CEL gremlins from harassing me until the ECU gets it's reprogramInteresting, I thought most of the later model 2000s by that point had 4 sensors, but maybe I'm wrong. I knew that some 2000s had 2 sensors, and others had 4, but I'm not sure if there's any rhyme or reason to that.
Federal or California doesn't mean anything to my knowledge. The Federal ones should pass inspections just fine, as should the California ones. I've never heard of anyone having any issues with either.
Update: Just talked to NGK rep and he had me go to https://ngksparkplugs.com/en/part-finder and use their part finder. It does have listings for Federal and CA emissions.
2000 4.0l 5spd
Federal emissions (Only 2 sensors)
23122 upstream
23099 downstream
Last edited: