New OEM Oxygen Sensor For Buick Chevrolet GMC Isuzu Oldsmoblie Pontiac Manufactured with the highest grade materials for prolonged life and superior performance One-piece laser welded body for maximum protection and precise operation maintaining sensor integrity Dual internal talc seal makes Our Oxygen sensors last longer Breathable Teflon membrane allows increased air flow for a faster switch rate to improve fuel economy and save the motorist money at the pump