I just purchased a used 2008 Cobalt with <7k miles. The battery had been replaced, wiping any codes as well as requiring the I/M Readiness test to be performed.
The EVAP test shows as incomplete. It had been driven 250 miles since the codes were cleared, and I've driven it more since then. I tried idling the car at cold start, but I still don't get the "OK" for the EVAP test.
No codes have been recorded, only the incomplete EVAP test.
Any ideas as to how much driving should get this test completed?