How to Replace an Oxygen Sensor in a Mercedes C320

1. Jack up the front of the C320 using a floor jack under the front jack point behind the radiator.
2. Place jack stands under the frame of the vehicle and lower the C320 onto the stands.
3. Climb under the vehicle and locate the oxygen sensors on the exhaust. They will look like small plugs screwed into the exhaust. There will be one before the catalytic converter and one after it.
4. Unplug the leads running to the oxygen sensors.
5. Unbolt the oxygen sensors using an O2 sensor socket and socket wrench.
6. Thread and tighten the replacement oxygen sensors and lower the C320 to the ground. Installation is the reverse of removal.