Two quick question on O2 sensor multiplugs...do the plugs have to be removed from the harness to come apart and do the plugs just slide apart or do I have do depress the little dimple/switch on the side? Any assistance will be greatly appreciated.

 

OK, so I got out 3 of the 4 oxygen sensors, but my passenger side front O2 sensor harness is melted together. It's not showing a P0134 or P0130 code, so I think my harness is still OK, just have to get it apart. All this just to change a crankshaft position sensor...figured if I was going to drop the front pipe, I might as well change the entire exhaust system while I'm at it. My Borla/Magnaflow exhaust has been sitting in my basement for a while, so I guess now's a good a time as any.