Dorman 917-856 Mass Air Flow Sensor Restores the engine to proper operation by determining the most efficient air or fuel mixture for achieving clean burns Constructed from high-quality materials to successfully resist damage from extreme underhood temperatures and environmental factors, such as humidity Direct fit for a trouble-free replacement Comes with a Torx bit for ease of installation (sensor only) Save time, money and labor by replacing only the sensor, instead of the entire mass air flow assembly