P0303 code

[TexasMojitoRubi]

I’ve had that happen numerous times after a rebuild. At least no spare parts!

Did you have to completely remove exhaust manifold/cat, or were you able to just unbolt and slip head off?

Unbolt and slip from the head. 1 of the four bolts on each side is stupid hard to get at.

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[TexasMojitoRubi]

Last update. I'm guessing some oil leaked on the the o2 sensor on bank 1 -sensor 2 when tearing the car apart. Popped a code 0137 after about 10 miles and ran rough. Replaced 02 sensor roughness went away. Codes cleared. Repair seems to be done. Jeep seems to be happy.

And final final update: I sold it. Its gone.