C30 System Readiness Check Issue

I also own a C30 and had a similar issue after using an OBD2 scanner, specifically the system readiness status failing. The car runs fine, but it likely won't pass emissions with the check engine light on. Were you doing any modifications, or just reading the error codes?

I didn't attempt any modifications, just reading error codes. Is it possible the OBD2 device reset the system readiness?

That's correct. Clearing codes on a Volvo C30 also resets all system readiness 'flags'. These flags are specific tests the car runs to ensure the emissions systems are working correctly. You need to drive the car for the computer to run these tests again; clearing the error memory was unnecessary. Have you considered a certified workshop?

I appreciate the clarification. I understand I have to drive the car so the monitors are set to 'ready'. After a short drive today, the error disappeared, just as you described. Thank you for your input; I saved 0€ on unnecessary workshop costs.