Short Answer
Looks like the 4th instar of Thyanta custator, the Red-shouldered stink bug, a type of stink bug found in Oregon.

Oregon Dept. of Agriculture
Long Answer
Definitely a nymph of some species of true bug (order Hemiptera), most likely in the suborder Heteroptera (i.e., the shield bugs, stink bugs, assassin bugs, etc.) and family Pentatomidae.
For example, see these photos of nymphs of similar species:

From L->R: Podisus maculiventris, Troilus luridus, Glaucias amyoti, Cosmopepla lintneriana, Carpocoris purpureipennis, Murgantia histrionica
Using yet another species, Piezodorus lituratus, as an example, you can see how a Pentatomidae nymph typically develops to maturity:

Source
As to your species...
Your specimen's physical appearance (i.e., black/white body with yellow band and centered red spot) appears to match that of the 4th instar of Thyanta custator, the Red-shouldered stink bug.

Oregon Dept. of Agriculture
From Oregon Dept. of Agriculture:
Nymphs are dark brown to black. Early nymphs have two distinctive pale spots on
opposite sides of their abdomens and appear hairy compared to other stink bug nymphs. Thyanta custator is very closely related to T. pallidovirens and they are morphologically indistinguishable, but there is chromosomal evidence that they are separate species
- Your 2nd image does appear to have some "fuzziness" around the body's edge -- possibly this hairiness?
This species is listed as living in Oregon:
- Oregon's Dept. of Agriculture provides this resource showing common stink bugs found in your state. Species include: Perillus bioculatus, Banasa dimidiata, Chinavia hilaris, Chinavia hilaris, Chlorochroa rossiana, Thyanta custator, Cosmopepla conspicillaris, Cosmopepla uhleri, Cosmopepla intergressa, Cosmopepla lintneriana, Holcostethus abbreviatus, Holcostethus limbolarius, Holcostethus tristis, Trichopepla aurora, Antheminia remota, Brochymena affinis, Brochymena quadripustulata, Euschistus conspersus, Euschistus variolarius, Halyomorpha halys, and others as possible specimens.
