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I use a MAC tools OBDII scanner. It supports all the tests and real-time data plots like O2 sensor activity and costs around $100.
My son had a MAC Tools truck business, and before that he was a Volvo Master Tech, and was his choice outside of the Volvo scan tool.
If you want to get all the Volvo codes, not just the engine codes, but transmission, ABS, HVAC, and Cruise Control codes, you can make a flashing LED device to read them off the OBDII connector. Only the Volvo scanner supports these codes.
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