P0174 just means that, as you are driving around closed loop, the PCM is having to richen it up on bank 2 to the point where the fuel trims hit a preprogrammed limit and sets a DTC. This can be caused by a bunch of things, including an exhaust leak, a bad O2 sensor, or a miscalbrated MAF transfer funtion in the tune. I was getting that code every couple of weeks, and the cause was a combination of an exhaust leak and a poor MAF transfer function in my tune. The exhaust leak was caused by a broken motor mount. Bank 2 on my car is the passenger side, but I think it can vary.

 

Thanks for the response. I am willing to bet that it is a tune issue. I will see when I bring it back to my tuner. I just wanted to make sure that nothing would happen if I drove it around. :thanks:

 

Markolson is bang on target. Just dont drive at WOT at 160mph and you'll be alright. haha.

Jk dont drive it very hard until you get it sorted. Could also be a bad injector on that bank. Make sure to check exhaust (exhaust leak before the O2 sensor will make the sensor read lean ,too much O2). Then injectors then MAF.

 

Bank 2 is driver side. Aside from checking for an exhaust leak, check to make sure that you do not have any post-MAF air leaks (i.e. inlet tubing, vacuum leaks, etc.). Most likely it's just a simple tuning issue to be addressed, and if so then Bank 1 is probably off, but not quite as far to trip the DTC (there is a +/- 25% window).

 

Al when did this code set. This is why I keep telling you to go return Bro. You can only iron out so much on a return-less at your power level. Good luck with your tuner. :wink:

 

It first came on when I was going home from E-town on April 10th. I'm actually going back to E-town this Sunday cause that's where the tuner will be and where he wants to fine tune it. To bad James isn't local.

 

My car has been throwing this code since my Whipple install as well. Comes on every 3-4 drive cycles regardless of how I drive. I agree with markolson, and in my case I believe it is tune related. Let us know what you find out!!

 

Chest, that's just a simple tune issue. Your MAF transfer is off.

 

Thank you sir, I will mention it to my tuner!