PO442 and PO442 PD Code Explanation for 2000 Mitsubishi Montero Sport
I'm currently seeing both PO44或2 and PO442 PD on my 2000 Mitsubishi Montero Sport. I've checked everything from the gas cap to the fuel vapor system components. Common causes of the PO442 code include: - A loose or improperly secured gas cap - A non-conforming gas cap (e.g., not the original factory brand) - A small leak or hole in a fuel vapor hose or tube - Other minor leaks within the EVAP (Evaporative Emission) system - A faulty vent o-ring seal The presence of both PO442 and PO442 PD is confusing. What does 'PD' at the end of PO442 mean? I understand that it's related to a pending fault, but I'd like clarification on how this differs from a fully active code.
The 'PD' in PO442 PD stands for 'Pending'. It means the Powertrain Control Module (PCM) is detecting the same conditions that triggered the initial PO442 fault, but hasn't yet met all the thresholds to log a permanent code. The PCM will likely log the fault again if those conditions persist. For example, in cases like misfire codes PO304 and PO306, both active, a pending code such as PO300 may exist — it has not yet reached sufficient counter thresholds to be flagged, but all criteria for triggering an alert are present.