I just bought a SCT X4 and hooked it up to my truck. After a while my check engine light came on so I checked the codes and it said that bank 1 & 2 were running rich. Any suggestions on how to fix this would be great!

 

If you weren't having the issue before and have made no other mods, it may be the tune. If you remove the tune, drive it for a while then look at long term fuel trim and see if it is in the negative teens. If it is, then you may have an issue that is being exacerbated by the tune. If not, then call the company who makes the tuner and get them to look into it.

 

I cleaned my mass airflow sensor and that did the trick for a while. I ended up having to turn off the cold air intake setting and the whole truck runs so much better!

 

Edit: ignore this, I thought this was from this year, didn't look at the date correctly

Interesting, I have the same codes after using my x4. I will turn off the intake setting and report back. On another note I'm not sure I really care for the tunes, have you guys found you like yours?

 

I cleaned my MAF with CRC Mass Airflow Cleaner Started guzzling gasoline and CEL came on. Was told that the O2 sensor was stuck wide open. It's still at the dealer and as of yesterday was told tat its still running rich and they wanting to do some more tests before changing any part. I just had them change all plugs and coils, a new cat and O2 sensor two weeks prior.