That's what I thought. I will try that.
Thanx.

this car has only 9000km.
installed custom tune, road test 10km , check engine light came on.
i erased the code with a diagnostic scan tool and started the car and the code came back within one minute. Did this twice.
p0405 is a circuit code between the egr and pcm and there is no problem with the ...

P0405.
I know that's an EGR code and this car has not been modified in that way.
Now what should I do?

I have not modified that in any way.

U7146, v.9r07b univ rev2
2004 Mustang GT, V8 4.6
Check engine light came on after I installed custom tune. Stays on.
Code P0405.
Car is running well.

I had the same problem. I clicked auto connect on the DSdownloader, that finally made it transfer.

I have the EXACT same problem, but mine is a U7146 9r07b and it freezes at 3%
Vehicle : 2004 Mustang GT 4.6

Part # U7146, Version: V.9r07b Hardware:univ rev2
How do I get a Custom Tune?

2004 Mustang GT 4.6
Modifications:
Removed Cateletic Convertors
Installed X Pipe (BBK)
Magniflow Exhaust from X pipe back. 2.5"
Installed Cold Air Intake (BBK)

Need to program so check engine light does not come on as ...