What does engine code 502 mean?

The engine code "502" doesn't have a universal meaning. Its interpretation depends entirely on the system or device that's generating the error. Different manufacturers and platforms use this code to indicate various problems.

To understand what "502" means, you need to specify where you encountered this code. For example:

* Web server (e.g., Apache, Nginx): Often signifies a "Bad Gateway" error. This typically means one server received an invalid response from another server it was trying to access to fulfill a request. It's a problem with communication between servers, not necessarily a problem on the end-user's machine.

* Game console: Each console (PlayStation, Xbox, etc.) has its own error codes. 502 would have a unique meaning within their systems.

* Specific application or software: The software's documentation is the place to look for error code definitions.

* Car engine: This code wouldn't be used in this context. On-board diagnostic (OBD) codes for cars are typically different.

In short: Provide the context where you saw the "502" engine code for a proper explanation.