How Do I Access Engine Codes for an '89 Volvo 240? Auto diagnostics
1Plug the OBD I scanner into the large open port on the driver's side dashboard underneath the steering column.
2Put the key into the ignition Obd2 scanner, and turn it to the "ACC" position, but don't crank the engine. Wait while the scanner turns on. Some scan tools have an on/off switch that needs to be turned on.
3Select the "Read Codes" command from the scanner's menu. Wait for the scanner to interface with the OBD computer. Write the engine codes it displays on a piece of paper.4Unplug the scanner.
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