Stuck, Rusty O2 Sensor - 1989 F150 4.9L 

Heat the pipe more than the other so it will expand from the o2

Unfortunately i walked away defeated tonight,had my vehicle on jack stands so i was too scared to hammer it.Tomorrow i will try a heat gun and a WD 40 and if that doesn't work,i'm bringing the vehicle to a mechanic. Thanks for this video.

Changed one on 94 Cheyenne yesterday soaked wth kroil 2 weeks in advance finally got time to work on it tried vise grips no luck. Got out propane torch but decided against using it I worked on boilers for 40 years got out my pipe wrench and old Betsy my ball peen hammer after 3 blows it broke loose then used the vise grips to remove it. My boy took me advance auto pick up a Bosch for 37.00 plus tax wires were not as long as original but got it together boy my truck sure runs better. I'm 71 still at it.

One other trick I saw was to put a hose clamp on the O2 sensor socket - keep it from spreading .

Thanks for posting this. Were you keeping most of the heat on the bung or just heating everything?

You Don't heat up sensor you heat up the NUT that it screws in to... HEAT EXPANDS,, therefor you want the NUT to expand and LET GO of the sensor,,,,

Have you any clue where to ides

Mine come out easy with a 7/8 open end wrench after spraying it with stuff to loosen bolts.

Is there only one O2 sensor? I have the same year and 4.9