Transmission

Tiny
LANCE405
  • MEMBER
  • 2004 FORD MUSTANG
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
When I put it in drive it will go but it will not shift out of first. Now sometimes it will shift but when it does the mileage goes blank () and the overdrive light starts flashing. It will shift fine for a little bit, for instance lets say I get on the highway it will it will go for about a 1/4 mile and then it looses power. Like the gears are not engaging. I took it O'Reilly's and got it scanned and says all four O2 sensors are bad, EGR valve and the speed sensor was bad, I replaced the speed sensor and I am still having the same problem. Now if I manually put the car first gear and shift to second it does fine, but I still need third and fourth.
Thursday, March 9th, 2017 AT 8:08 AM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check battery for condition most places do for free. I doubt it is all 4 O2 sensors. If that does not work have a mechanic scan it as there is something like a wire shorting out causing this possibly.
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Thursday, March 9th, 2017 AT 9:34 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,671 POSTS
I would also unplug the small wires alternator and go for a short drive to see if it works. I am thinking you might have a diode leaking throwing AC voltage. Also, unplug all of the o2 sensors and do the same thing.

Please run this test and get back to us so we can continue helping you.

Best, Ken
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Thursday, March 9th, 2017 AT 2:28 PM

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