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And I think my oxygen sensor is finally slowly going out.. for almost 2 months it's been fine.. but after I did a ECu reset after putting on a new muffler (magnaflow) it's sometimes stumbles from idle to about 2500.

 

I was looking at the voltages at idle it's back and forth but last time I check with my o-scope I can't remember how fast it was reacting.

 

Should I use a wrench or a socket for the oxygen sensor?

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I just cut off the wires going to the 02 sensor at the sensor, then use a spark plug size socket on a 3/8" drive. Then I slide about a 2 foot bar over the end of the drive handle for added turning leverage. Install new sensor with an open end wrench.

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