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If not already, you may want to repeat the socket 2 fault code test for any additional fault codes.
You can test the oxygen sensor using a electric digital multimeter. From the FAQ (copy and paste link into to browser tab or window):
https://www.brickboard.com/FAQ/700-900/EngineSensors.htm#OxygenSensorLifeandDiagnostics
Meanwhile, read this to test your oxygen sensor. As Art B. indicates the red harbor freight digital electric multimeter may not be accurate.
https://www.brickboard.com/RWD/volvo/1628410/220/240/260/280/oxygen_sensor_code.html
Questions?
Hope that helps keep your Volvo Cool!
cheers,
MacDuff
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Beh.
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