You will need a special deep well socket that is uniquely designed to remove oxygen sensors. It can be purchased at any neighborhood auto parts store. Often the threads of the old sensor will lock up and seize and if you force the sensor you will strip the threads of the manifold or exhaust component. Pre-soak the old sensor in PB blaster for hours ahead of time and continue with the blaster while removing the sensor. Use off and on motion with your ratchet so that the threads do not seize up...all the while continue to spray with PB blaster.

If the threads do get messed up even after above procedure then pick up a thread chaser at same auto parts store (usually 18 mm X 1.5) and crank that through the threads on the exhaust piece. Make sure the trace tool is aligned properly with the threaded hole... DO NOT CROSS THREAD. Install the new sensor... clear the old code and you are finished.

Suggest you drive car up on some sort of ramp to give yourself working clearance.

__________________
Earl



1993 190E 2.3
2000 Toyota 4x4 Tundra