Rather than purchasing the special purpose contact extractor, which can be quite pricey, I use a tiny-tiny screwdriver tip to slide in beside the contact to depress the locking tang (red circle). Then the contact can be pulled free by tugging gently on the wire or by using needle nose pliers. By tiny I mean one of those that aren't much larger than the ones you tighten your eye glasses with.
Sometimes there is a locking tang on BOTH sides of the contact, necessitating the use of TWO tiny screwdrivers simultaneously. Although yours will probably look different than this photo, the principle is the same. Red arrow depicts which direction to insert the screwdriver and the blue arrow depicts which direction the contact is extracted from the connector.

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Current rides: 2018 Volvo S60 Inscription (What the heck do all these buttons do?), 2005 Volvo S80 2.5T (Soon to go bye-bye), 2003 Volvo V70 2.4NA (The family "truck"), 1973 Volvo 1800ES (STILL not road worthy!)
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