ok i got a 99 maxima cali fed and i needed to change all the o2 sensors so i did that and cleared the light so now the light keeps comin back and now i have a egr light can the egr cause the o2 sensors to show on the check engine light im goin to change the egr today but just need some insight

 

...How exactly do you have a 'Cali Fed' emissions spec? It's either one or the other, not both.

EGR light? You mean EGR code? The EGR code won't cause the O2 sensor codes under any sort of normal conditions.

We can't give you any insight without knowing exactly what codes you're pulling, really.

 

I think you said that the o2 sensor codes are still there, in that case the sensors themselves were not the problem. Test the connections.