P014C P014D code
 

Car has run flawless for 18k miles so far. I have borla uel headers, greddy axle back exhaust and Crawford billet power blocks with the OFT stg 2 tune. Today I had these two codes pop up. I believe they are something to do with the 02 sensor getting poor readings. I know my front o2 sensor is not seen by the ecu but could not having a cat throw off the reading of the second sensor? I'm in Canada so the temperature is starting to dip. This will be the first winter with catless headers. Anyone have done experience with this codes?

P0420 is the code that pops up for cat efficiency , but thgis is disabled in oft stage 2 tunes

the codes your getting indicate problem with 02 sensors slow response.

have you run leaded fuel by any chance this can poision O2 sensors or maybe some weird fuel additive ?

your car still need input from both 02 sensors, the front sensor is kain one for afr but i believe rear O2 comes into play for cruise control and cruising afr compensation. if you remove rear 02 i believe cruise control disabled.

could possibly be air leak log your afr and wideband afr this is output from front and rear 02 sensors on oft and log long term fuel trim LTFT

I always run shell v-power 91, I'm about a 1/4 way through a fresh tank of gas now. I reset the code so I'll see if it pops up again. I have to do my oft updates tonite. I'll see if I can figure out how to log.

Kind of off topic, I've never liked shell brand gas. They have made me lose power on my cars, and given check engine lights.

^ What gas u use most of the time then? Chevron?

Only shell v-power 91 since new.

I'll try to get a data log tonite, but just my observation on my way to work this morning. Car pulls normal in gears 1-3, 4th gear and beyond it hardly pulls above 4k rpm

So here is a data log from today...hopefully someone knows how to read this cause I sure don't.
http://www.datazap.me/u/triumphrider...2?log=0&data=1