Just replaced my o2 sensors on the ute & noticed the one behind the cat had a blue connector on the loom & the other at the turbo had a green one. The plugs were basically the same save for the indexing tabs on the sensors themselves. I snapped the tabs off the sensor & just plugged it in to the loom. My understanding is that o2 sensors are pretty much to a standard & they should work when plugged in. So far, no warnings/limp, economy seems better, power is good. Anyone know if there is a difference? (couldn't imagine they would use two different sensors like that surely? I'll ask a former FPV sparky I work with tomorrow as well)