Question about 2003 Mercury Sable
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Posted on Jan 02, 2017
Barring any vacuum leaks, P0401 is indicative of a bad EGR valve. Hope this answers your question. Best of luck.
Posted on May 30, 2009
SOURCE: Does my 2003 mercury Sable
Your vehicle has four oxygen sensors. There is a vacuum line underneath the throttle body that regularly fails, causing the lean condition, and the whistling and surging. Very dificult to see, but with the engine running usually you can fine the vacuum leak with your fingers. Hose is non-reinforced rubber, and is shaped in a 90 degree bend. If memory serves me right, it is the pcv hose. Replace this and your problems will cease.
Posted on Aug 19, 2011
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