Hi.
Trying to remove a Oxygen Sensor from a 95 Honda Civic.
Is in a darn bad spot! Have about 6 inches max to maneuver... and cannot get darn thing loose (118,000 miles on car).
Tried putting a little WD-40 type spray on end of sensor, but just cannot get any leverage, and am also afraid of breaking something.
Any helpful hints?
Bob
P.S. I am using the special socket with opening for the wires, and regular rachet wrench.

Remove heat shield, spray old oxygen sensor with PB Blaster (let it sit for a while), spray with PB Blaster again, warm car up for several minutes, and use a 15 inch breaker bar on the end of the oxygen sensor socket. Afterwards, clean threads thoroughly with brake cleaner, allow it to sit for a while, and install new oxygen sensor.

Thx,
I used Sea Foam Deep Creep. Is PB Blaster a whole lot better? If so, will that also work mixing in with gas to clean carburator gum out?
Bob

No, PB Blaster won't do that. However, like Kroil, it's a great penetrant.

Or, once you remove the heat shield, You want to get a propane torch ($14-$21 at walmart) and heat the space where the O2 sensor screws into. This will allow some movement due to the expansion of the surrounding metal, and the sealant. Be careful, wear gloves, it gets really hot.

Just a final reply on this thread... thank you txgreasemonkey (and others) for your help. With the PB Blaster and following your process, the sensor came out fairly easily. Although I tend to be reluctant to buy new parts or tools to do a job, you know your stuff, and it did work!
Bob
P.S. I am starting a new thread concerning some problems/questions I have with the new sensor.