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I wouldn't replace the connector unless you can see physical damage to the wires. I know at some point Volvo improved the way the wires are supported. I don't know if that was a production change for a certain year, but I know if you order the harness part number now it has some kind of bracket.
So, if the wires are intact, it sounds like you need a new sensor. The insulation will be worn a few inches from the connector if it is bad. Pull the sleeve around the wires up a bit and look in there. If the insulation around the wires is good, the harness is OK.
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Paul NW Indiana '89 744 Turbo 145K/ '90 745 turbo 127K
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