Replacing O2 sensors
#5
With the stock exhaust it is pretty simple, with it on the car.
With aftermarket exhausts like the one I have, it will be a bit more of a PITA because of the shape of the cats...but still not impossible.
With aftermarket exhausts like the one I have, it will be a bit more of a PITA because of the shape of the cats...but still not impossible.
#6
Yes, you can do it with the exhaust still in the car. You need an O2 sensor wrench. It is also a LOT easier if you lower the engine a bit by loosening the rear motor mount bolts a bit.
GL,
Jon
GL,
Jon
#7
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#9
The hex is 22mm. You can not get a socket on the O2 sensor. You need a O2 wrench. or a open end wrench. The wires out of the sensor is what keeps you from using a socket or box end wrench, you just can not get in on with out cutting the wires off.
#10
No need to lower the engine. 7/8" open-ended american works just fine. Count the number of flats you turn to get the sensor out and then pre-twist (backwards) by that number into the replacement wire. That will avoid any stress kinks in the replacement.
Last edited by Al Norton; 01-11-2011 at 08:46 PM.
#11
I did mine without lowering the engine. However, it took over a week for the scrapes to heal on my hands. Would have been much easier with the engine 1/2" lower.
#14
I have done this twice on my tt and the second time the threading was damaged on the old o2 sensor due to the galvanic corrosion.
If this happens to you need an M18x1.5 tap to cleen the threadings in the exhaust.
If this happens to you need an M18x1.5 tap to cleen the threadings in the exhaust.