SOURCE: 2000 Ford Windstar 3.8L error P0401 then P0404
if the check engine light is blinking,you have a misfire(spark plugs,plug wires or coil pack.inspect the plug wires for damage.The rear bank plug wires (at the fire wall) get alot of heat and the boots will crack, causing a misfire.You might want to have your local shop check it for you,to see if there is an open circuit or shorting in one or more of the plug wires.if it has been awhile since a tune-up,you might want to do that first,and inspect the plug wire boots also and replace them if needed.
Testimonial: "Thanks, That is very helpful advice and I cannot rule it out but I just had my plugs, wires & coil pack replaced 6 months ago. Any other advice? Thx"
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