/diy/ - Do It Yourself

Can anyone help a retard identify what type of temperature sensors these are? They're pulled from a diesel exhaust system, (2012 peterbilt 386)the SCR portion to be specific. Model number is 2894876.

I'm guessing they're some sort of NTC thermistors, however, measured resistance at room temperature is around 17.7 Kohms. When i squeeze it with my hand, the resistance dips down to around 14Kohm.
The closest rating I can see for typical thermistors near this is 20k, which doesn't seem to be the case.

One thing also bothering me, is thermistors have a small range, up to like 250 degrees celsius max for some, but where these probes are placed in the exhaust system temperatures are typically reaching as high as 400 degrees celsius

Wiring diagrams aren't helpful at all, and all product pages for this model number don't provide anything as to what the fuck these are exactly. I can't replace them, I need to read them as they are directly