Ok, so I've gotten the P0420 code a couple of times, first time it was probably around a thousand miles after the cat-less header install with the non-fouler extension. (I think I revved it quite a bit)... second time was around 400 miles later (I KNOW I revved it in neutral and took it up to over 5.5K RPM while getting onto the interstate). I know what causes both of those (lack of cat :lol:) and probably that the non-fouler home made setup is letting more exhaust flow to the second O2 sensor than it should, so I already ordered BLOX Racing CEL Eliminator Adaptor and hope that will fix it.
But last night after installing black cat custom gauges I took my car on quite a few short (and sometimes intense :D) trips while calibrating the speedometer, and on one of them my CEL came on again (it's been only about 180 miles since the last one).
I took it to the nearest AutoZone thinking it's the same P0420 telling me that the cat's "not working well", but it ended up being P0133 letting me know that for whatever reason my first O2 sensor is not functioning well. When I took it out while swapping headers it looked fine and it didn't look like there were any issues with the wires coming to the sensor, so I just reset the codes (they were in two banks, even though CEL only came on last night...
Any ideas what might have caused the P0133 code? I hope it was just a glitch (I did almost stall the car 'cause I didn't give it enough gas while I was making a U-turn)...
