[A4] o2 sensor

[Brizax at aol.com]

its a pretty basic repair, its just a tight squeeze, youd need to remove the 
air box "air filter and maf, then look down on the large oval exaust pipe 
coming off the turbo, one sensor is up high one is on the bottom right  "assuming 
you guys have 1.8t's" youll need a good wrench, dont try and use an 
adjustable, i think its a 17mm but might be wrong, if you go to pep boys or advanced 
auto etc they can scan codes for free and tell you if its the pre or post cat o2 
sensor, GL :)