Having problems with your 1999 Ford Crown Victoria ?
WANT TO TURN OFF TROUBLE LIGHT. - 1999 Ford Crown Victoria
I tend to agree partially with scottofldaho above, except that one way you can reset them at home sometimes is to removed the battery cable for a while. Problem is this will reset your clock and all radio stations and settings you have already and it doesn't always work. Kragen auto parts may also be helpful.
Buy a scan tool with the ability to reset the check engine light. Some simple one's aren't too expensive. Talk to the people at Auto Zone. They may reset it for you and read any codes for you.
Repair Help & Product Troubleshooting for 1999 Ford Crown Victoria
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