Bosch Thimble Oxygen Sensors Patented thimble ceramic element featuring the Bosch patented Platinum Power Grid and the patented Bosch Double Layer Protection System for optimized sensing and peak performance and maximum service life Protection tube ensures 100% accurate sensor performance Fast-acting heater optimizes sensor operation on 3- and 4- wire sensors only Double laser-welded stainless steel body is totally submersible to seal tight and protect against contamination for long life Bosch Planar Oxygen Sensors Ceramic element with integrated heater requires less power to activate and reaches operating temperature more quickly than a thimble element reducing harmful emissions during the critical cold start phase Improved protection tube provides increased thermal resistance for long life Laser weld and Viton sealing system is totally submersible to seal tight and protect against contamination for long life
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