WHILE driving,especially on the highway, my check engine light which is already on begins to flassh. trying to find more likely reason.
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1998 Ford Expedition
Question: FLASHING CHECK ENGINE LIGHT
Answer #1fernando August 13, 2010, 15:48Master
This is a very serious failure of the emission control system on your vehicle. Have it diagnose ASAP by a qualified technician.
Answer #2hemicuda August 13, 2010, 16:01Master
You need to have a shop scan for codes to determine what repair is required and you can locate a shop near you here http://repairpal.com/directory?address=73127&car_bran... and once they determine the repair you can check prices here http://repairpal.com/estimator?car_type_id=2317
Answer #3Visitor, October 11, 2010, 20:18
I own the same truck. Had same problem. The OWNER manual states, steady light usually an emmision problem. Flashing Check Engine light means a miss-firing cylinder. This can cause damage to catalytic converter, etc. Check plugs, wires, etc. My problem was a bad wire to cylinder # 4 (Most difficult plug to reach I have ever encountered) A miss-fire can and will also damage the coil. (didn't fix soon enough) Replaced wire and coil, and of course changed out all the plugs. Either reset check engine light with a scan, or drive 20-30 miles and if you did good, the light will no longer flash. Good luck. Denis