Computer problem
1998 BMW 318 4 cyl Two Wheel Drive Automatic 109000 miles
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eng service lite on. no codes are present when dealer looks at it. done 3 times. lite comes back on after a month or so. is it computer? everything on list that turns on liet has been replaced, except for catalytic converter. it does not show on code.

Yes it is the DME, I have seen many of these fail due to failure to complete all monitors for Ca. smog cert.