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What is error code e31 on a 1992 Cadillac DeVille sedan?

There's no standard, universally recognized "E31" error code for a 1992 Cadillac DeVille. Cadillac used different diagnostic systems in that era, and there wasn't a consistent, standardized alphanumeric error code system like later OBD-II systems.

To find out what "E31" means, you'd need to consult:

* The owner's manual: It might have a section on troubleshooting codes, especially if the car has a simpler onboard diagnostic system.

* A Cadillac DeVille service manual specific to the 1992 model year: These manuals are often detailed and provide code descriptions and troubleshooting steps. You can find these online (e.g., eBay, Helms, etc.) or at auto parts stores.

* A professional mechanic: They have access to diagnostic tools and service information that can pinpoint the problem.

The code might be specific to a particular aftermarket diagnostic tool or even be a misreading of another code. Without more information about the source of this error code, it's impossible to interpret it.