Used Cars

Proposed changes to the used-car Buyers Guide required by the Federal Trade Commission have been criticized by consumer groups and the attorneys general of 22 states, who say the revisions would be a setback in consumer protection.

The critics are urging the F.T.C. not to adopt the changes — the first since 1995 — which they say could result in consumers’ being misled about their legal rights or not learning the full history of a car damaged in a flood or a crash.