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The OBD will tell you you have bad symptom before a failing component is identified through the OBD on your 1992 240 Volvo.
Like the 02 sensor as others in this thread direct you to test with your multimeter.
I forget to mention using a multimeter and verify all's well from the connected component all the was back to the controller connector (back probed) sometimes.
Yet still please check socket six for EZK 116 ignition, and EGR, if fitted, fault codes. You have only sockets two and six on the black OBD box on your 240.
Hope that helps.
B.
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