What does the engine light mean on 2002 Chevy van express 1500?

The illuminated engine light (often a check engine light, depicted as a stylized engine) on your 2002 Chevy Express 1500 indicates a problem detected by the vehicle's onboard diagnostic (OBD) system. It doesn't tell you *what* the problem is, only that a problem exists.

To find out the specific issue, you'll need to get the diagnostic trouble codes (DTCs) read. You can do this in a few ways:

* OBD-II Scanner: Buy a relatively inexpensive OBD-II scanner (available at most auto parts stores). Plug it into the OBD-II port (usually under the dashboard) and it will read the codes. The codes will be numbers (like P0171, P0420, etc.). You can then look up the meaning of these codes online (many free resources are available) or in a repair manual.

* Auto Parts Store: Many auto parts stores will read the codes for free. They might even offer a preliminary diagnosis, but keep in mind they are trying to sell you parts, so get a second opinion if you're unsure.

* Mechanic: A qualified mechanic will be able to diagnose the problem and provide the most accurate repair advice. This is the most reliable, but also the most expensive, option.

Ignoring the engine light could lead to more serious (and expensive) problems down the line. It's best to get it checked as soon as possible.