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The O2 sensor wire plugs have a plastic retainer pin that secures the connector clip. Those are a PITA to remove mostly because it is difficult to get two hands on the plug (the front driver's side is the easiest). The center of the pin has to be squeezed slightly in order to remove it.
Also, both front sensors are held into the rear of the cylinder head with some sort of plastic clip. You actually have to remove/break that clip in order to fully access the plug. If you are able to remove that without breaking it, great. I couldn't so, when I re-assembled everything, I just used zip ties to secure the O2 plugs and wires out of the way.
The rear sensor plugs are not that easy to get to either so, my advice is just patience.
+1 for the PB Penetrating Catalyst to remove the O2 sensors. Spray, wait about 15 min, and they come out like butter!
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Performance Mods:
Kooks 1-7/8 LTs; Calico coated w/HFCs, Solo Mach XL catback w/J-pipes, VMax TB, C.A.I. Intake, JRE Tune, RX Catch-Can
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