It is recommended a test be conducted a second time
If time permits, it is in your best interest to run the cycle again after the vehicle has COOLED down. Doing this second Readiness Drive Cycle Test should insure that all problems have been repaired, Flags have been set, all monitors are in the ready condition, the MIL will remain out, and the vehicle is ready to pass an I/M 240 test.
If the MIL comes back on during Drive Cycle Test 1 or 2, then further repairs are most likely needed or you did not perform the Drive Cycle Test properly. It is better that you discover this before you return the vehicle to the customer allowing you to complete the needed repairs.
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