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Hello, I got a problem. After I installed my header, my O2 sensor light went on, the yellow light on dash. I believe it is the sensor's light. Anywayz, I'm pretty sure there's no problem with the wire and I screw it back on pretty well. So, I think it might because the sensor is getting excess of flow.... (that's what i think) that made the light went on. If so, how do I fix it/ reset it. ECU?

 
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Take out the battery wait 10 mins or just take out the ecu fuse so you don't have to reset your radio presets. start your car, don't touch the gas. let it idle for 10 mins. turn off car. turn on car. turn off car. turn on and drive away.

do a search to find more ways of doing it that might work better

 
Rep Power: 812

If it's just the top portion header, you shouldn't be getting any light. If it's a full version, maybe one of the holes isn't plugged or you forgot to put the sensor back on. Or the header is leaking maybe. Did you use new gaskets?

 
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yup new gasket comes with it... I screwed them back on pretty tight... >_<