The Clean Air Act is a federal law in the United States that regulates air pollution emissions from motor vehicles and other sources. The act prohibits the manufacture, sale, or installation of any device that is intended to defeat or bypass the emission control systems of a vehicle.
An exhaust gas temperature (EGT) sensor is a device that measures the temperature of exhaust gases as they exit the engine. This information is important for engine performance and efficiency optimization.
An EGT sensor does not violate the Clean Air Act because it is not designed or intended to defeat, bypass, or shut down any emission control devices. Instead, it simply measures the temperature of the exhaust gases and provides data that can be used to optimize engine performance and fuel efficiency.
In fact, many modern vehicles are equipped with EGT sensors as part of their standard equipment to help ensure that emissions are kept within legal limits. These sensors can also help diagnose problems with the engine or emission control systems, leading to faster repairs and more efficient operation of the vehicle.
In summary, an EGT sensor is a legal device that can be installed on a vehicle without violating the Clean Air Act, as long as it is not intended to defeat or bypass any emission control systems.