* OBD-II Scanner: This is the most reliable method. A scan tool (available at auto parts stores for relatively inexpensive prices, or more advanced ones for mechanics) will plug into the OBD-II port (usually located under the dashboard) and read the diagnostic trouble codes (DTCs). The codes will be numeric and you can then look up their meaning in a repair manual or online database (like a Haynes manual or sites dedicated to automotive repair information).
* Flashing Light Method (Less Reliable): Some older vehicles, *including some from that era*, might have a method of retrieving codes by observing a pattern of flashing lights (typically the check engine light itself). However, this method is less reliable and not universally applicable. Even if your S10 *does* support this, finding the exact procedure for your model year is crucial, and doing so would require consulting your owner's manual or a very specific online resource for that vehicle. This is not recommended as the OBD-II scanner is far more accurate and efficient.
In short: Buy or borrow an OBD-II scanner. It's the easiest and most reliable way to understand what your check engine light is trying to tell you. Trying to decipher anything else risks misdiagnosis and wasted time and money.
