My Federal W-2 box 15 is blank and box 16 is blank but box 17 has a State Income Tax.
I did receive two state W-2s -
1) CA - boxes 15 & 16 are completed but no box 17 State Income Tax
2) OR - box 15,16 & 17 are completed
Last year same employer W-2 only contained OR W-2, this year it is so confusing.
Since you are still a California resident, you need to file a California resident tax return and an Oregon non-resident tax return. Both California and Oregon will consider your income taxable, but California will give you a credit for the state tax you pay to pay to Oregon. Between the two states, you will end up paying a combined state tax rate equal to whichever state has the highest rate.
When you prepare your state tax returns, start with the Oregon non-resident tax return first. The program likes it better that way.