I finally threw a couple of codes after over 18 months with a Maggie, American Racing Headers, long tubes with hiflow cats, through a NoWeeds diverter through stock mufflers.
I had Ted Jannetty send me a SCT Tuner with his custom tune for my setup and it was perfect. It ran sweet and no problems, Until I started running with the NoWeeds open pretty much so it was too loud, and probably running less back pressure, causing it to maybe run a bit lean. The car has always backfired while coasting off the throttle some, but it became more often and louder with the NoWeeds near half open.
The codes I got were P013E and P014A
I searched this forum but could not find much about them.
I finally googled and found a simple website that I think we all could use to fine these baffling codes.
Go to: www.dtcsearch.com
Type in the code and it shows what it is.
Really neat and simple.
P013E is O2 sensor delayed response-rich to lean Bank 1 Sensor 2
P014A is same thing but Bank 2 Sensor 2
So the last few days of driving with it "A Bit To Loud" finally threw a code. I cleared the codes with the SCT Tuner and now will quiet my act down a bit and see if things will go back to normal.
The main thing here is the website above that makes decoding the codes a snap. I thought I would find my solution in this forum, but I didn't. I hope this helps others trying to see what their "dtc codes mean".
