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1998 BMW 740 transmission won't shift

Tiny
JACOB FROESE
  • MEMBER
  • 1998 BMW 740
  • V8
  • 2WD
  • AUTOMATIC
  • 278,000 MILES
I took the trany off to repair a coolent leak between the engin and transmission and after putting everything back together the transmission won't shift unless I drive it very aggresive, I can shift in manual.I used a scaner and it comes up with a code p0720 out put sensor. How hard is that to replace? And do you have any other ideas what to look for?
Thanks for your Help
Jake
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Wednesday, February 25th, 2009 AT 9:08 AM

3 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
It is going to take dropping the pan(save the oil) to access the output speed sensor, part # 24-34-1-218-551, get a gasket and a filter too, and a little of the very expensive tranny fluid to top it off. I have also seen the wiring harness give problems, part# 24-34-1-423-719.
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Wednesday, February 25th, 2009 AT 9:22 AM
Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
With all due respect to Dr Hagerty, I would advise you to check the loom to the transmission make sure you did not pinch it between the transmission and the engine, or damage it in any way, also check the plugs make sure you did not damage them, or push the pins back inside the plug.
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Friday, February 27th, 2009 AT 1:20 AM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Excellent point Dr. Loot, I agree and thank you for the respect.
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Friday, February 27th, 2009 AT 8:14 AM

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