Provenance fights are a recurring feature: bidders point out that a clean Carfax can hide a damage report that shows on Autocheck, and the two services draw on overlapping-but-different data. Some argue Carfax 'minor' flags can be mis-keyed dealer service entries rather than real accident damage, so buyers are pushed to reconcile both reports and get independent verification.
Carfax vs. Autocheck damage-disclosure disputes
Mercedes-Benz C43/C63 AMG (W205) · buying