my engine light came on with a code p0401 it is bad? on 2005 Mercury Monterey

THE SHOP WHERE I WAS CLOSE TOO TOLD ME I NEED TO FIX IT FAST. BEFORE IT, GIVE ME MORE PROBLEMS, IM NOT SURE IF THIS IS TRUE, THEY TOLD ME THAT THEY NEED TO REPLACE SPARK PLUGS N WIRES FUEL FILTER. IS THIS TRUE. WOULD LIKE TO HERE 2ND OPINION. THANKS

by in Waukegan, IL on September 30, 2011
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3 answers
ANSWER by , October 02, 2011
http://www.obd-codes.com/p0401 P0401 is Insufficient EGR Flow, it may be true your engine needs a tune up but this alone is not going to attend to the true cause of the Check Engine Light being on.
ANSWER by , March 09, 2012
just my take on this; have a 04 monterey van (best road beast ive ever had....); if you engine light is on solid...return fuel sensor and fuel filter need to bee replaced. if your engine light is blinking....whoe to you...catylitic converter. 03/09/12 spent 800 on new gas limiter/sensor (left rear of engine block) new drive belt and front end align with two new tires; front wheel drive love it; 4.2 litre side six (i've blown off mustangs from time to time). veriy comfortable leather fully adj. seats and all good stuff. cd/am/fm/engine comp totally clean etc. no brag, just fact. took a year or so to get this machine trustworthy. i'd take it anywhere/anytime.
ANSWER by , September 30, 2011
not true, what you need to do is to read the codes in your computer with a scan computer and replease the sensor that is not working properly