Oxygen Sensor Replacement
here is the article:
http://www.12v.org/maintenance/repairs/o2sens.php
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I myself will ONLY use the right O2's for our car, many of tho other old hands here will agree.
Your O2 sensor sends a voltage form 0v to 1v to the ECU 0v, .1v, .2v, .3v ect ect. These are super small voltages that can easily be resisted by crimp/sotter jobs....hence why I recommend OEM O2 sensors.
Are you in Canada or the us?
what year is your 12v, this determines if you need 2 or 3 O2 sensors. 95 or newer you only need 2
Part # 13396 here (if you are in the states) just $$ enough for free shipping too

http://www.autohausaz.com/search/pro...xygen%20Sensor
Canada...
Just checked my Canadian source and the deal is so much better at the above link, better part too, that you would still be cheaper importing it.
good news is that I have NEVER seen O2 sensors for our cars that cheap and that it is a easy job if you have 1/2 inch extension bars for your ratchet...go right in form the top
http://www.bestpricecarparts.com/
but not for this particular item (O2's)
Even with the shipping to NS (they offer 45 % off the regular UPS prices), you may still come ahead of what else you can find out there...genuine Bosch.
www.genuineaudiparts.com is also very good for a VW/Audi online store, sometimes their prices beat everyone else, and they are a dealer! For my A6, they have coil packs cheaper than anyone out there.
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