This code is related to the EGR system. Inspect the vaccum lines around the EGR valve and see if there are any breaks. These get brittle with age. It may be stuck open or closed as well, and if this is the case you will need to replace this. Go to rockauto.com and you should be able to find it for around $100.
http://www.obd-codes.com/p0406
SOURCE: lincoln ls has a trouble code p1336 and po350
P0350 is Ignition coil primary/secondary circuit malfunction,could be faulty igntion coil or module.P1336 is crankshaft position system variation not learned.This is done with a Tech2 at your local dealership you would be best served taking this car to your dealer to have it diagnoised.
SOURCE: 200 lincoln ls 3.9 codes 171 174 300
171 and 174 mean it is running lean and 300 means a random cylinder misfire
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