I'm new to the world of audi as I have always worked on more domestic cars I came across a b6 a4 w the 3.0 that is pulling a code for the rear o2 sensors as being bad. What is involved w replacing these most oxygen sensors are cut and dry as far as replacement typically but for some reason people i speak w act as if it's major. If anybody has a write up or can guide me in the right direction i would gladly appreciate it thanks in advance hope to get some great feedback from you all.

 

what did you find out???