C on an auction sheet: Corrosion
C (腐食) means: Corrosion that has eaten into the metal, worse than surface rust. The inspector draws it on the car diagram where the damage is, with a number from 1 to 3 for its size.
By size
Corrosion that has eaten into the metal, worse than surface rust. Size 1: small (about the size of a coin, a few cm).
Watch out: Structural corrosion can fail compliance or a roadworthy inspection.
Corrosion that has eaten into the metal, worse than surface rust. Size 2: medium (hand-sized).
Watch out: Structural corrosion can fail compliance or a roadworthy inspection.
Corrosion that has eaten into the metal, worse than surface rust. Size 3: large (bigger than a hand, clearly visible).
Watch out: Structural corrosion can fail compliance or a roadworthy inspection.
Other damage codes
Upload the auction sheet and get every mark on a car map, the inspector's notes in English, the landed cost and whether you can import it, from A$15.