The onboard computer on a 1998 Ford Windstar, known as a power train control module (PCM), monitors the power train management systems. In the event the PCM detects a fault, it generates a diagnostic trouble code, which turns on the check engine light to alert you about the malfunction. Once you've run the codes, diagnosed the Windstar and fixed the problem, you need to clear the codes from the computer. Anyone with basic auto-repair knowledge can perform this task in less than 15 minutes.
Remove the black plastic dust cover on the Windstar's diagnostic port located under the dashboard near the steering column. Connect your scan tool's datalink cable to the port.2
Turn the ignition key to the run position. Perform a quick test on the Windstar's PCM per your scan tool's specific instructions.3
Erase the Windstar's diagnostic trouble codes when prompted to do so by your scan tool. Complete the quick test and disconnect the datalink cable from the Windstar's diagnostic port. Put the dust cover back on the port.4
Shut the ignition off.