Are the engines on 1997 Saturn sedan and a 2001 compatible?

Not necessarily. While both 1997 and 2001 Saturn sedans likely used similar engine families, the exact engine and its components (like the transmission) varied by model and trim level. A direct swap isn't guaranteed to be compatible.

To determine compatibility, you need to know the *exact* engine codes for both cars. These codes (often a combination of letters and numbers) are usually found on a sticker on the engine itself, or in the owner's manual. Even with matching engine codes, minor differences in year-specific parts might require adjustments.

Simply having the same displacement (e.g., both 2.2L engines) isn't sufficient; internal components, mounting points, and even the computer systems controlling the engine can differ. You'd need to compare the specifics to be sure.