white dust from antifreeze ?
Could be ?? And certainly not implausible, as my particular automobile is kind of famous for that.. though my engine has not yet had those signs and likely had a head gasket replaced just before warranty was up, is the only thing that makes sense to me. When I see the signs, I know what to do and I am ready. But none yet.
As to your question, that car had seen EXTENSIVE:
- Decarboning efforts.. a variety of ways
- Extended high speed driving, quite a few 12 hour plus drives at the faster side of highway speed.
- Idling.
- that sensor may have been original, I don’t remember it ever being given attention.
Mechanic said:
1. “stuff was coming out of it” (tapped it to show me. Looked like sand.)
2. One wire was almost burned through.. said he didn’t like how it looked overall.
3. Base seemed burned black, possibly with oil.
Could be catalytic converter material, engine crud, actual carbon, actual sand… oil fouled, high speed glazed version of an O2 sensor, I haven’t seen any internal nor external coolant leak although. Could be almost anything else.
Car passed inspection yesterday, didn’t even bother to change the upstream although I now have it.
The more you know.