hi,i just installed the test pipe for my 04' G35(2004,June).After installation, the check engine light is on.SO i don't know what i should do. i installed the
O2 already,but cel still on.A mechanic guy of Nissan tell me he can turn that light off.Is it right way or i just leave the light working? thank u,guys, i need ur help.

 

check for leaks, think if the o2 sensor got fouled, or try an ECU reset

 

any other idea?thank u