While using low-quality or cheap fuel may potentially contribute to emission-related problems over time, it's unlikely to be the sole reason for the emission control light to illuminate.
Cheap or low-grade gas can have higher levels of impurities and additives that may affect engine performance and emissions, but they wouldn't immediately trigger the emission control light.
If the emission control light is on, it is advisable to have the vehicle diagnosed by a qualified mechanic to identify the root cause of the issue. Ignoring the emission control light can lead to further problems and potential damage to the vehicle's emission system.
