ok so i just had a set of headers put on my nissan na 300zx while i was getting them on they werent able to put in the o2 sensors. with my car now running with out them im getting a sound that sounds like metal getting hit with a hammer. and its dieing out on a stop light. and its starting to run my gas down

running no o2 sensors is not a good idea, the o2 sensors have an adaptor plug on them thats why there is 2 nuts take the big one off and they will thread into the headers. i scratched my head with that problem when putting my headers on then realized what was going on. This is the nut you have to take offNotice the smaller thread on the o2 sensor without the nut on it hope this solves your problem

ok thanks i ordered 2 new ones cuz the people that put the headers on just trashed my manifolds but thanks i knew that driving with out them wouldnt be good and so far my gas has dropped like a rock but thanks for the help

im guessing its to late but those ams ones are $50 a peice from z1 and you get a deal if you buy too. i just bought some last week.