[V6-12v] o2 Sensors Replacement Help

[Tom Christiansen]

Calvyn,

If you can get a 22mm box end wrench onto the sensor, don't bother with the 
crowfoot. You'll get more leverage with the wrench. You might consider 
applying more force by using a cheater bar (length of pipe extending the 
handle of the wrench). However, if space is tight a crowfoot and a long 
breaker bar might be the answer. You can also try tapping the sensor with a 
hammer (hit where the sensor meets the pipe). Sometimes that breaks the 
rust lose. But whatever you do make sure you're using the right size tools. 
If it's 7/8 use 7/8. If it's 22mm use 22mm. Too big tools will round off 
the hex and make it impossible to remove that sensor.

I don't know of any particular tricks. But I've also never removed a 
post-cat O2 sensor (or even owned a car with a post-cat sensor).

Tom


At 08:57 PM 6/24/2005, Calvyn wrote:
>Hello all.
>
>         Anyone know any tricks to removing the post-cat o2 sensors? The
>front ones are a piece of cake thanks to a nice deep-well 7/8 socket, a
>universal, and several extensions, but the rears are a real PITA. I can get
>a 7/8 line wrench on them or a 22mm crescent wrench. I've tried penetrating
>oil and heat but neither is budging. Do I need to unbolt the exhaust from
>the manifold and drop it down to get a better grip on them? I fear that
>because the exhaust is looking rough and don't wanna monkey with the rust
>that might be holding it together. :) Saw on the AudiWorld forums something
>about using a crowfoot.
><http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=47928>
>
>         Any and All suggestions are welcome except for one who says to take
>it to the dealer to do. :)
>
>Thanks,
>-Calvyn-
>
>********************************
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