u/Dry_Track_7540

Chasing a P0430 - new cat and Motorcraft up/downstream O2 sensors on Bank 2. No other codes. Slight shudder at idle.

Seems to be engine running rich—-

Bank 1 long term fuel trim solid 0 at idle, STFT floats a bit but generally steady at 2.3.

Bank 2, on the other hand, LTFT sticks at -4.7 while STFT sits at 7. At idle, LTFT never comes of -4.7, the STFT will float a bit.

What should I be looking for at this point?

3.5L 2015

I’ve got a DTC that’s in process of being resolved that I can clear - it’ll pop back up (P0430) when the monitor tests are complete - but I want to make a couple of body module changes before it’s fixed. Can I or do DTCs need to fully resolved?