What happens if the Malfunction Indicator Light is triggered?

The Malfunction Indicator Light (MIL), commonly known as the "check engine light," is an important component of the vehicle's onboard diagnostics system. When this light is triggered, it signals that the vehicle’s emission system has detected a problem that could lead to increased emissions. This could include issues such as a faulty oxygen sensor, a malfunctioning catalytic converter, or problems with the fuel injection system.

The activation of the MIL serves as a warning to the driver that an inspection is necessary to address the underlying issue in order to ensure compliance with emissions regulations and to maintain the vehicle’s performance. Ignoring this light can lead to worsening problems and potentially increased repair costs as well as negatively impacting air quality due to higher emissions.

Understanding the role of the Malfunction Indicator Light is crucial for emissions inspectors, as it helps identify vehicles that may require further diagnostic testing or repairs to comply with environmental standards.