I couldn't pass the smog-check because EGR data is not ready. But it doesn't give any error codes (Engine Light is NOT on and no other indicators are on). Is there an EGR sensor somewhere that might be at fault?

Usually you get EGR Not Ready when the car is stored for more than a few months, but I drove more than 1000 miles since I didn't pass the smog check, so the data should be there.

Please advice: Should I replace the EGR Valve or is there a sensor somewhere?

Thanks in advance.