my96f150

1996 F-150 4.9L

So I did a drive cycle after changing the battery and no lights are coming on. But I'm failing my emissions tests in Oregon.

I'm getting p0133, p0420, p0171, p0174 warning lights. So, in that order: O2 Sensor Circuit Slow Response - Bank 1 Sensor Sensor 1, Catalyst System Efficiency Below Threshold - Bank 1, System Too Lean - Bank 1, System Too Lean - Bank 2.

Originally it was all my O2 sensors failing, which of course was faulty. Had the computer replaced, and one O2 sensor. Worked and passed DEQ. Now I'm at a loss. I replaced another O2 sensor and that didn't fix it. Ran it hot for an hour before testing. Like 70-80mph on the highway to get er cooking.

Not sure what to do. Any tips for a rookie? I've done a lot of basic stuff (new solenoid, changed starter, changed alternator, swapped some battery cables, etc.). But I can't seem to figure out why I'm failing emissions. Got some injector stuff to put in, just haven't done it yet.

Thanks folks!