nox to high for my 95 240sx!

[Miren_1998]

can any body help me, failed my smog at cali.15mph co2-14.64,o2-.25,hc-76,co-.16,no-702=pass25mph co2-14.48,o2-.21,hc-0,co-.01,no-864=failed

i got headers on but all emission are connected, and also have a greddy exhaust cat back and recently installed a extra catalytic converter so now i have two. please help me?

[NISTECH]

check your egr operation. I just answered 2 other NOx failure posts in this forum in the last couple of weeks. look down the thread list you should see them they both cover egr and nox stuff pretty good.

Welcome to nico BTW.

[NISTECH]

http://www.nissaninfiniticlub....72750

[Miren_1998]

thanks for helping me just passed my smog!!!!!! i just had to put some back pressure on my exhaust system, using a steel plate drilled with holes near my catalytic conveter. thanks NISTECH>