NTK 21546, Oxygen Sensors, 4 Piece LotCondition:* New Surplus Stock, In OEM Packaging. As Pictured.Additional Notes:* Oxygen Sensors Are Used In Modern Automobiles To Control The Fuel And Ignition Systems* Thread Diameter: 18mm* Wire Length: 419mm/16.5″* Connector Type: OE Type* Mounting Type: Threaded* Heated: Yes* Number of Wires: 4NTK 21546