O2 Sensor Replacement
Thread Starter
Racer
Joined: May 2002
Posts: 251
Likes: 1
From: Tampa, Florida
O2 Sensor Replacement
Yes, I checked the archives and could not find the answer... on a 95 993 there are two O2 sensors... From looking at the part photo it seems like a simple plug and mount. Has anyone done this themselves. Is it straightforward? I appreciate any words of guidance.
Thanks,
Thanks,
Three Wheelin'
Joined: May 2001
Posts: 1,672
Likes: 52
From: Chicago
Jack,
I watched while the race shop I use installed a new 02 sensor track side. My wires from one of the sensors got too close to my cat and melted causing my check engine light to come on. It took them all of 10 min start to finish. Break the nut on the sensor, may want to treat it with a little WD40 or some other lub. once free, screw the new one in and plug the wire end to the harness. If you had a check engine light because of 02 failure, your local shop will have to re set light. Very simple DYI
I watched while the race shop I use installed a new 02 sensor track side. My wires from one of the sensors got too close to my cat and melted causing my check engine light to come on. It took them all of 10 min start to finish. Break the nut on the sensor, may want to treat it with a little WD40 or some other lub. once free, screw the new one in and plug the wire end to the harness. If you had a check engine light because of 02 failure, your local shop will have to re set light. Very simple DYI
Rennlist
Lifetime Member
Lifetime Member
Joined: May 2001
Posts: 3,651
Likes: 8
From: Chino hills, CA
Jack,
Typically if you want to replace a O2 sensor with the proper tool and to torque it down properly you will need to use a special "Lambda-probe" socket (In America I think everyone calls it Oxygen sensor socket), basically it has a slot on the side of the socket to allow the wire to hang out so you can fit a ratchet on the socket to tighten it. As using an open ended wrench may strip it.
There are many source where you can buy this tool, but under the "Hazet" catalog it is under their #4680 catagory tools. Below is a picture of it. I am not sure exactly which one you need because I do not know the size needed for the 993 O2 sensor.
The factory shop manual also recommend replacing the sealing ring (900 123 009 20) when you replace the O2 sensor. Torque it to 50-60 Nm.
Typically if you want to replace a O2 sensor with the proper tool and to torque it down properly you will need to use a special "Lambda-probe" socket (In America I think everyone calls it Oxygen sensor socket), basically it has a slot on the side of the socket to allow the wire to hang out so you can fit a ratchet on the socket to tighten it. As using an open ended wrench may strip it.
There are many source where you can buy this tool, but under the "Hazet" catalog it is under their #4680 catagory tools. Below is a picture of it. I am not sure exactly which one you need because I do not know the size needed for the 993 O2 sensor.
The factory shop manual also recommend replacing the sealing ring (900 123 009 20) when you replace the O2 sensor. Torque it to 50-60 Nm.
Burning Brakes
Joined: May 2001
Posts: 967
Likes: 1
I replaced my O2 sensor a month or so ago. It’s no big deal, at least on my early ’95, which only has one sensor. The biggest pain is connector, which threads up through a hole in the engine guard and then into a connector box. I disconnected it first, and pulled the whole wire assembly out. I used a box end wrench. I just put the end of the wire connector through the hole in the wrench and slid the wrench up to the sensor. I didn’t need any WD-40 or anything. Installation was the reverse. The new sensor came with the sealing ring.
