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To reset the check engine light after replacing a purge valve, first make sure the car is turned off. Proceed by disconnecting the battery; remove the negative cable and leave it disconnected for about 15 minutes. This break allows the vehicle's computer (ECU) to reset and clears the error code from its memory. Reconnect the battery cable after the time elapses. Alternatively, you can use an OBD-II scanner, plugging it into the vehicle’s diagnostic port (usually found under the dashboard), and follow the prompts to clear the error codes. Regardless of the method chosen, it's crucial to drive your car afterwards for a short period. This allows the ECU to recalibrate and ensures the repair has addressed the issue. If the light comes back on, further diagnostics may be needed as it could indicate additional or underlying issues that weren’t resolved by changing the purge valve alone.