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
3 answers
ANSWER by on 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
ANSWER by on 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 on 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.