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If they hooked a sniffer to your tail pipe u would have failed.I just passed my emissions with a bad secondary O2 sensor (threw a P0420, which is what you'd get with a race header/no catalyst convertor). So I enabled ODBII and Set Rediness the night before I went. All they did was plug into OBDII and run some scan, I passed. On the drive home my CEL went back on. :shady: