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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 09-15-2016, 07:13 PM   #1
Registered User
Join Date: Feb 2007
Location: Cali
Posts: 1
My Ride: 2006 M3
replaced transmission speed sensor 2006 BMW M3 SMG with Competition Package

I got the dreaded yellow cog wheel at 80,000 miles on my all factory original OEM 2006 SMG M3 with a competition package.
My M3 was having trouble finding the right gear during downshifts and was hesitating to shift from 1st gear to 2nd gear on starts.
Sometimes on downshifts during turns my readout would say M3 was in 3rd gear, but car would be in neutral and would require manual shift to 2nd gear to reengage transmission.
My Local BMW was unable to diagnose or make it go away. BMW wanted to hold my car for weeks to send diagnostics to headquarters and have engineers attempt to find the ghost in my machine!!!
BMW did give me a clue saying, my M3 had multiple fault codes regarding speed sensor. After months of OBD code checks from local enthusiast friends.

I took the plunge and bought a $110 (X8516) transmission speed sensor! from BMW.

Easy as Pie!!!!

I jacked up my beloved M3 and placed the front end on floor jack stands.
I removed only the passenger side undercarriage shielding.
I reached in, unplugged and removed the bad speed sensor that was held in place by only one allen bolt. (if you look closely you can see tiny metal shavings on the old speed sensor attracted to the magnet in sensor)
I wonder if the metal shavings on sensor blocked sensor from sending signal?
no transmission fluid leaked out (hope M3 inclined on jacks helped & its not low on fluid) new sensor came with new O-ring.
I placed and tightened single bolt on new speed sensor and plugged it in.
I closed up undercarriage shielding and my M3 that was throwing fits for months drove like a charm!!!!!!!!!
I can't believe how easy it was and the problem that was nagging my M3 for months was solved!!!

Thanks E46 fanatics and all my friends for the pictures, suggestions, and help!
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