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On Board Diagnostic Testscstroud 10-07-2002, 10:29 PM With the engine running on my '99 740iL, if the trip button and the fault code display button are both held simultaneously, the computer goes into a diagnostic test mode and the display reads Test . . . Does anyone have the details on what is going on and the usefulness of these tests? :confused: Bear 10-08-2002, 06:59 AM EMail me at lazybears2@cox.net and I will send you the Code Book and How To on the hidden codes. vBulletin®, Copyright ©2009, Jelsoft Enterprises Ltd.
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