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On The Diag Connector Under The Dash There Are Two Terminals Usually Upper Right 2 Right Nexxt To Each Other That Accually Have Metal Connectors In Them With The Key Off Use A Paper Clip Or Something To Jump The Two Together Then Turn The Key On Just To Ignition Dont Try To Start Car ,like You Want To Listen To The Radio Or Something.the First Code Will Be 12. 1 Flash Then A Pause Then 2 Then A Longer Pause.it Will Flash Code 12 Three Times This Means Your In Diag Mode If There Are Any Codes It Will Flash Them In Numarical Order Three Times Example Code 34 After It Flashes Code 12 Three Times It Would Flash 3 Times Then Pause Then Flash 4 Times.it Will Flash Each Code Three Times In A Row.then When Its Done It Will Flash 12 Three Times Again.oh Ya The Check Engine Light Is What Will Flash.then Shut Key Off Befroe You Remove Jumper Wire From Connector................good Luck