3 posts in Car Diagnostics blog about "windscreen" — OBD-II diagnostics, DTC codes, repair. ← All posts
Before assuming a fault, check the switch position and what is stuck to the windscreen. Both explain more of these than any failed component.
The sensor does not see rain. It measures how light reflects inside the windscreen, which explains almost everything about how it fails.
A chip the size of a grain becomes a crack in one frost. What can be repaired, and why replacement now involves the electronics.