1. Make sure the parking brake is engaged.
2. Turn the key to the "On" position (but don't crank yet). This allows the car's computer to power up and run diagnostics. Wait a few seconds.
3. Press the brake pedal (automatic transmission). This is necessary for most automatic transmissions to start.
4. Turn the key to the "Start" position. The engine should crank and start.
If it doesn't start, consider these possibilities:
* Check for any error messages on the dashboard. This might point to a different problem.
* Ensure the car is in "Park" (automatic) or "Neutral" (manual).
* Try turning the key again. Sometimes it takes a second attempt.
* Check the gas cap. A loose or improperly sealed gas cap can trigger a check engine light and affect starting (though unlikely to completely prevent it).
If none of this works, there's a problem unrelated to adding gas, and you'll need further troubleshooting or a mechanic.
