Check engine light 1998 Expedition 5.4L

I bought a new gas cap a few months ago (not Ford OEM). Every month or so, my check engine light comes on. It takes 60 miles or so to make it go out. Any tricks or should I go and buy a Ford gas cap?



That CEL (check engine light) is just a kid in class waving her hand trying to get you attention because she has the answer. You need to have the codes read. Some places will read them for FREE. Try Autozone or Advanced Auto Parts. Get the exact code (like P0123) not just their translation into English and post it back here.

Regarding warning lights:

  1. if the coolant temp light comes on, shut off the engine ASAP

  2. if the oil warning light comes on, shut off the engine ASAP

  3. if a FLASHING MIL/CEL comes on, shut off the engine ASAP

    ASAP means driving to the berm of the highway right now and not waiting for the next exit.

But if the MIL/CEL is not flashing, then it’s not an urgent indicator.

If this is happening after each fuel fill-up, the gas cap seal may be not be sealing air tight.

I wouldnt spend any money on anything without first scanning the computer for codes. Auto Zone or Advance auto parts will scan it for free. Post back with the trouble codes and we can go from there.