Originally Posted by Mustang_2005
Okay is the bad O2 sensor a known issue?
My 2011 V6
threw the same darn code 4 months after my buddy installed my BBK headers and off road x pipe. At first I thought it was a glitch because the car was running fine and I would just clear the code using my performance tuner. Every few days after the code was cleared , the check engine
light would come on. I would check using my performance tuner to read the computer and it was the same 02 sensor code that you are also getting and I first got.
I began calling American Muscle and doing research along with asking my mechanic friends. The problem was either a bad 02 sensor or had an exhaust leak. I took my car into an exhaust shop and after examining the car, no exhaust leak what so ever. I excepted the fact the solution was too spend 114 dollars on a new 02 sensor, so I called AM and ordered one. It came several days later, I installed the new 02 sensor and poof, no more check engine light. Problem solved. My factory 02 sensor just went bad around 24,000 plus miles. Because of the bbk headers and x pipe I already knew this factory 02 sensor would not be covered under a warranty item because of the modification.
I just think your factory 02 sensor took a dump, not so much a known problem and unfortunately stuff breaks. Hope this helps you!