Some helpful hints: 1. Don't go half-assed on the sensors. Pay a little more and get OEM from AB for instance. D2's are sensitive to cheapies. 2. If you replace one, make sure you replace it's opposite. If you can swing it, replace all four. 3. To get the old ones out, soak them in penetrant the night before, cut the wire and get a box end on them to avoid stripping the nut. 4. There is a trick to the plug. If you just pull on it, it will not come unplugged. The entire plug assembly (both sides connected) is attached to the vehicle via small metal tabs. You must first remove the connected plugs from this metal tab and then the connectors will come apart.