How do you get the emissions module to ready. on 2000 Volvo V40

I had some work done on my 2000 V40 and need to get the emissions passed and every time they hook up the test equipment, it says not ready.

Asked by for the 2000 Volvo V40
All the monitors in the ECM reset if power is lost, and the only way to get them to set is to drive the vehicle until the ECM decides to run the monitor tests..Always seems to take forever..