Ignition coils don't tend to fail in a gradual manner. Usually a bad coil will abruptly stop producing spark. This coil is sold as an integrated unit with the power stage (the portion where the wiring loom plugs in).
You can test for weak performance if you have a Multi-meter. Volvo calls for primary resistance of 0.5 to 1.5 ohms and for the secondary 8000 to 9000 ohms.
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