 We found flaws that should have been noticed during promised inspections and certified cars that were totaled wrecks that were rebuilt and resold. All too often, we hear from buyers who discover a problem after the sale. Remember, once you sign the contract, that vehicle is yours. Even if the car is covered by a warranty or service contract, it may be a hassle to get it repaired. That's consumer man Herb Weisbaum, a contributing editor at Checkbook.org. You can read more at WTOP.com, search used cars.