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To access trouble codes on a 2002 Cadillac STS without an OBD-II tool, you can use the key-on, engine-off method. Turn the ignition key to the "On" position without starting the engine, then quickly turn it off and back to "On" three times in succession. The dashboard warning lights will flash, and the codes will be displayed in a sequence on the dashboard. Note that this method may not work for all issues and is less reliable than using an OBD-II scanner.

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2mo ago

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