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Old 09-26-2011, 04:44 PM   #1
Join Date: Aug 2007
Location: Toronto
Posts: 49
Trans Fail Safe, left me stranded


Might need the best minds on this one as I'm about done with this money pit.

P0720 Output Speed Sensor error code, along with BMW codes 121, 120, 132, 106. 1st Gear Ratio, 2nd Gear Ratio, Input/Turbine error in no particular order.

Car is in limp mode and had to get towed to mechanic. Diagnosed battery and alternator and both are fine. Ignition Switch replaced last year. Switched camshaft position sensor last month and everything was gravy until... now.

What's next? Change output speed sensor? Anyone experience this before? Sort of sad at 150,000KM one owner.

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Old 09-26-2011, 10:49 PM   #2
3rd Gear Member
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Join Date: May 2008
Location: Markham
Posts: 458

If the Trans Fail Safe Mode resets when the car cools down then check out this thread I posted and linked to my original post on bimmerforums.

Good Luck
'99 E39 540iT

Last edited by MLue1; 09-26-2011 at 11:13 PM. Reason: typo and comment
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