I Just Joined Your Site And Just Purchased A 01 3.8 V6 This Month. The Day After, I Had My Service Engine Soon Lite Come On. I Had It Scanned With The Obd2 And It Came Up As P0401 Egr-insufficient Flow. The Dealer I Got It From Jerked Around With It For Several Days Off And On Claiming They Fixed It But The Lite Continued.
One Week Later I Had Straight Thru Dual Exahuast With Flowmaster 40s Installed. The Same Lite With The Same Code As Above Still Continues. The Egr Valave Has Been Replaced. The Stang Runs Fine And Sounds Fantastic.
Anyone Have This Experince And Have Any Ideas On How To Get This Lite Off? Reprogram Computer? Add H Pipe For Back Pressure? Replace Egr Intake Switch/selenoid?
From Some Reviews I Have Seen On This Site You Guys Have Some Great Stuff In Here And I Hope You Can Provide Some Excellent Advice On My Case Asap. Thanx.

 

you dont need to post the same thread numerous times. Just post it once and someone will try to help you out.