What is the engine code 66 for a 1997 jeep Cherokee?

There is no standard "engine code 66" for a 1997 Jeep Cherokee. Jeep uses various alphanumeric codes to identify engines (e.g., 4.0L, 2.5L, etc., often further specified within the VIN). A "66" code isn't part of their established engine identification system. To find the engine in your 1997 Jeep Cherokee, you need to look at one of these:

* The Vehicle Identification Number (VIN): The VIN contains a code that indicates the engine type.

* The Engine Block Itself: The engine typically has a casting number stamped on it.

* Your Vehicle's Documentation: Your owner's manual or other paperwork should specify the engine.

Without more information, it's impossible to determine what "66" might refer to in the context of your Jeep's engine. It could be a misremembered code, a code from a different system (like a diagnostic trouble code), or something else entirely.