Practice question

A malfunction indicator lamp (MIL) illuminated with a stored diagnostic trouble code (DTC) should first be diagnosed by:

  1. Clearing the code and ignoring it
  2. Retrieving the DTC with a scan tool and following the manufacturer's diagnostic procedure
  3. Disconnecting the battery permanently
  4. Replacing the ECU immediately

Answer: B — Retrieving the DTC with a scan tool and following the manufacturer's diagnostic procedure

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