Re: Ford mustang99 3.8L code po411,p1405,po172
Hey Paul. Paul here.
From one first-poster (almost) to another, I thought I'd chime in. Don't have any firm answers, or even solid advice for you. Just thought I'd commiserate and see if you got any further with your problem solving?
My '95 has given so many codes over the years I can't remember them all. But I do know that I've replaced every oxygen sensor, TPS, coolant temp sensor, and one or two other items over the years. Sometimes twice (oxygen sensors) and the light still comes on with another issue down the road.
Right now I'm dealing with P0171 and P0174 (if I remember) which are just Left and Right Bank Lean codes.
I just responded to another post where he (Bill) had a P0405 (edit: oops, his was a P0455) code. Maybe with a little roundy-round discussion something will pop up.