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Q:

DIAGNOSTIC CODES on 2002 Dodge Ram Van 1500

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I HAVE HEARD YOU CAN OBTAIN DIAGNOSTICS CODE BY TURNING THE KEY ON AND OFF. CAN YOU TELL ME THE PROCEDURE?
(1) Answer
yes, if you cycle the key 3 times and leave the key on, then the light will flash out codes.
it will not define the problem, just the system that has a failure.

a scan tool is the real tool that is required as you need freeze frame data and data to help track down the failure.

Roy