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There is a plug in connection for the O2 sensors on the back of the heads. I just did an install about a week ago. These plugs have a retention clip that must be pulled out before you can separate the plug, they are blue plastic and should be fairly easy to see. One the blue clip is removed, you must pry up a little on the tang of the plug, and pull the bottom section down. It's a little frustrating and I highly recommend you do this step before jacking the car up. Makes it much easier to reach back there.
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