Engine malfunction light comes on with reduced engine power and rough idle
Generally, the check engine light (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) comes on when something fairly serious is going on with the vehicle. This can happen for many different reasons such as a faulty mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement), a faulty O2 sensor (https://www.yourmechanic.com/services/oxygen-sensor-replacement), a...
