Oxygen Sensor for Land Rover Discovery 99-04 4-Wire Plug-In Type FREE 1-year UNLIMITED mileage warranty coverage on Evan-Fischer items purchased thru AUTO PARTS GIANT Store A high quality, Direct Fit OE Replacement Oxygen Sensor from Evan-Fischer 4-wire, Threaded-in, Thread Size: M18-1.5, Connector Gender: Female, Hex Size: 7/8 in., Wire Length: 13.4 in.