Description BRAND NEW GENUINE BAR Manifold Absolute Pressure MAP Sensor This is also known as a ‘Thrust Sensor’ and is used to measure air pressure within the boost pipes of your engine, as well as measuring the air temperature Genuine fully tested part.”MAP” sensor is an acronym for “manifold absolute pressure” “bar” is a measure of pressure. bar is roughly equal to atmospheric pressure or barometric pressure at sea level. This is roughly . psi or so. “Absolute pressure” is the total pressure in the manifold, including atmospheric pressure..Three bar map sensor for the B. Passat TDI BHW, all Touareg TDI models as well as the Beetle TDI. Used as an upgrade on ALH BEW models, allowing proper tuning of vehicles with up to pounds of boost..Description . Bar Map Sensor. OEM stock replacement for your ALH. This has the larger diameter plug that goes into the stock ALH intercooler..