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To replace the exhaust gas recirculation (EGR) control circuit on an Opel Astra G, first, disconnect the battery to ensure safety. Remove the EGR valve and the old wiring harness connected to it, noting the configuration for reinstallation. Install the new EGR control circuit by connecting the new wiring harness and mounting the EGR valve back in place. Finally, reconnect the battery and clear any diagnostic trouble codes using an OBD-II scanner if necessary.

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