Anyone can give me suggestion with my old Previa van that just failed smog check ?

lwf999lwf999 Member Posts: 1
edited March 2015 in Toyota
My Van just failed smog check from comprehensive visual inspection and functional check . and i took my Van to technical they help me to fix the engine light but my van had oil leaking underneath so will that be another problem that will failed again even i fix my engine Light because the Engine light used to stay on while driving but just burn out when i go smog check and it said ODB system check Failed and Other emission component Fail . i need some advice before i go retest .Pleaseeeeeeeeeeeeeee
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