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  • 1996 - 2004 SN95 Mustang -General/Talk-

2003 Mach 1 Wiring

  • Thread starter Thread starter JohnnyUtah
  • Start date Start date Mar 22, 2026
  • Tags Tags
    2003 mustang mach 1
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JohnnyUtah

Member
Mar 22, 2026
4
3
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New Jersey
Mar 22, 2026
#1
  • Mar 22, 2026
  • #1
New to the forum. Picked up a 03 Mach 1 and while cleaning I noticed this. Does anyone know what this connection is for? Can’t find a connection point for it.
 

squeak93

15 Year Member
Jun 2, 2005
2,260
362
164
Joplin, Missouri
Mar 23, 2026
#2
  • Mar 23, 2026
  • #2
Hard to see on the angle but you should have a heated PCV valve and it goes there. Guessing someone put a normal one in it's place and left that unplugged.
 
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