Verify that all engine components have been reconnected and installed properly. If this has not been done, reassemble or reconnect all components as needed. Check the oil level and coolant level. If this Road Test Verification procedure is for an OBD II System code, refer to OBD II DRIVE CYCLE in this section as needed. For previously read codes that have not been repaired, refer to the correct code repair chart and perform the repair test steps before continuing.