My dad's car has had a check engine light for awhile now and the car needs to be tested for emissions soon. The code is p0430 which is a catalyst efficiency error for bank 2. The car is an 06 taurus with the 3.0L pushrod vulcan engine.
We replaced the bank 2 downstream o2 sensor twice and the code returned both times. The first time my dad bought an aftermarket sensor from Napa. I figured that we just got a bad sensor and I told him to buy an oem sensor from the dealership parts counter. After a couple weeks with the new ford motorcraft sensor the CEL came back on.
The problem is obviously not the sensor. The car isn't that old and it has ~65k miles on it so I don't think the catalytic converter needs to be replaced. After doing a little research, it sounds like the DPFE module could be the problem. Anybody know where is the DPFE is located or how difficult it is to replace? Anyone have any other suggestions?
Mods, please feel free to move this thread. I wasn't sure where to post it.