Review on KAX 234-5107 Oxygen Sensor - Genuine Replacement for Original Equipment 250-25035, Heated O2 Sensor - Sensor 1 Upstream, 1 Piece by Kevin Gunnmann

Procedure: 1.) Go to your nearest auto parts store and "borrow" or "rent" for a dime the necessary tool to remove the oxygen sensor. (Only if you don't have or plan to buy one.) 2.) Remove the O2 sensor. Note: For my 2014 VW cc it was pretty easy, I took it off in 5 minutes. Disconnect the electrical cable, unscrew the O2 sensor. 3.) Important: Apply lubricant before installing the sensor. 4.) Proceed in reverse order of step 2. Screw on the sensor and then connect the electrical cable. Enjoy. out!