Walker Products Manifold absolute pressure sensors (MAP Sensor) measure manifold pressures through changing voltage and sends this information to the onboard computer. The computer uses this and other inputs to calculate the correct amount of fuel delivered. Symptoms of failure include poor starting, detonation, a check engine light, and or no start conditions. Sensors are non-serviceable and therefore must be replaced when non-functional. Walker Products began supplying the fuel system and engine management needs of the automotive industry since 1946. We continue our commitment to supplying products manufactured to meet or exceed OEM standards and specifications with the highest quality products. 2010-2019 Saab 9-5,Cadillac ATS,Chevrolet Camaro,Cadillac CT6,Cadillac CTS,Buick Envision,Chevrolet Equinox,Chevrolet Express 2500,Chevrolet Express 3500,Chevrolet Express 4500,Chevrolet Malibu,Buick Regal Sportback,Buick Regal TourX,Buick Regal,GMC Savana 2500,GMC Savana 3500,GMC Savana 4500,GMC Sierra 2500 HD,GMC Sierra 3500 HD,Chevrolet Silverado 2500 HD,Chevrolet Silverado 3500 HD,GMC Terrain,Chevrolet Traverse,Buick Verano,