I called Henderson Nissanwhere I took my car last time to get that SES diagnosed & smogged. They apparently did an idle air relearn & just drove it for a while to reset the monitors, after which it passed smog. The SES light came back on after about 100 miles. I should have taken it back right then, but I have one of those jobs where I work 10-14 hours per day 6 days a week.
The light came on only after installing the header and I can find nothing else that would cause that SES light. Everything leads back to it! Maybe I should try a different header?
I wish the Nismo catless header wasn't so damn expensive...
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