The NOx (Nitrogen Oxide) Sensor is a high-temperature sensor designed to detect NOx levels in diesel-fueled vehicles that must comply with state emissions regulations. As state emissions requirements become more demanding for diesel vehicles, it is imperative to have a quality sensor to notify the driver when high amounts of NOx levels are in the engine. Product Features:Direct replacement for an exact fit, restoring drivability and proper engine functionalityComplete with aluminum housing construction and heat sleeve to protect against both warping and crackingAnti-seize coating pre-applied to prevent high temperatures from damaging the unitRigorous quality inspection and testing has been undertaken to ensures conformance to product standards