A-B1715353-AI SENSOR-OILOne New Aftermarket Replacement Oil Sensor Fits Briggs and Stratton Small Engines This aftermarket replacement oil sensor (Sensor Oil) monitors the engine's oil level and triggers a low oil shutdown or warning to protect the engine from damage caused by insufficient lubrication. It is a direct replacement Fits Briggs & Fits Stratton (B&S) small engines used in lawn mowers, lawn tractors, generators, snow blowers, and other outdoor power equipment.