The term 'car frame' is composed of two crossword solutions: CHASSIS (7 letters) and CEL (3 letters). The CHASSIS is the main frame of a car, which supports the engine, suspension, and other components. It is usually made of steel or aluminum. The CEL, or Check Engine Light, is an indicator light found on the dashboard of a car. It is used to alert the driver when the car's computer detects a problem with the engine or other components.