This crankshaft sensor is intended for the Volkswagen Polo 9N, in its 9N1 and 9N3 versions fitted with 1.9 TDi 100/101 hp engines (engine codes ATD and AXR) as well as 1.9 TDi 130 hp (engine codes ASZ and BLT). It ensures detection of the crankshaft position and rotation speed, information essential for engine electronic management. In the context of restoration or maintenance of a classic Polo, replacement of this faulty or worn sensor allows for reliable and original-specification engine operation to be restored. A new part that guarantees continuity of vehicle use in the best conditions.