What brand of O2 sensors would you recommend? I have a 2002 a6 and need to replace the sensors (2 of them) to pass emissions. I know what the O2 sensors do/how they function, but I was wondering if there were any that would be better for performance/gas mileage than others.

Thanks for your help!

 

Idk who the F$#% bonny is but she should be removed. As far as o2 sensors, just get the bosch universals and splice them into the old harnesses. The cost of replacement OEM sensors is outrageous considering the only difference is the plastic harness bit.