I've been trying to find an issue with cylinder 4 for weeks and now I have more issues.
ETC codes
p0304
p0171
p0175
p0305
p0306
p1150
p1152
2003 ranger 3.0l v6 FFV 165 xxx

 

What have you checked besides getting the codes? You need to start with some basics, check for spark, check for fuel and check for vacuum leaks. Once completed this will help lead you down the right path

 

Welcome to the forum

Ignore P0171 and P1150 and 1152

Those are most likely being caused by the misfires, P030X, codes

O2 sensors only "sees" oxygen, not gasoline

A misfire means no Oxygen was burned in the engine so it is dumped into the exhaust and there is too much oxygen in the exhaust so O2s can work well, and too much oxygen in exhaust is Lean code.

Make sure coil pack firing order is correct, one side is different
3 4
2 6
1 5
front

or
1 5
2 6
3 4
front

Depends on coil

But the 5 6 4 or 4 6 5 side does get mixed up

And all your misfires are on the bank

P0171 and P0175 are contradictory so recheck that, it can happen if you done clear codes and new codes are added to old ones when doing engine work


Late 2003 3.0l could be in the 2004-2006 TSB about Ranger 3.0l engines getting recessed valve seats
Have to do compression test on all 6 cylinders, all spark plugs removed for the test.
Bad valve seat will cause lower compression in that cylinder
3.0l should run about 160psi