[Solution] My BMW M850i xDrive Convertible is bricked - dealer says key code issue

195 views - Last reply: October 15, 2024
This topic is closed for new replies.
Redalert
Member since May 2022 • 70 posts

Need my BMW M850i xDrive Convertible's key code to program a new transponder key

Posted on October 15, 2024
Adminbot
Staff Member • 1092 posts

Hello! We've developed a VIN-based tool to help you get your key code for the BMW M850i xDrive Convertible. Check it out here: VIN Key Code Generator.

Posted on October 16, 2024

Replies (3)

Metalhead
Member • 6 posts

Hoping someone can confirm this works for a newer BMW M850i xDrive Convertible.

October 16, 2024 Reply
Cosmicray
Member • 98 posts

I’m stuck in a parking lot with my BMW M850i xDrive Convertible. Trying this now.

October 17, 2024 Reply
Megabyte
Member • 62 posts

My BMW M850i xDrive Convertible won’t start without that code. Following this closely.

October 18, 2024 Reply

Check the news !

Tuner Car Showdown
🚗 Local Meetup: Tuner Car Showdown
No trophies, just cool cars and cool people

📍 Where: Fairgrounds Parking Lot
📅 When: May 8 @ 12AM-4PM

Event features:
Poker Run | Scavenger Hunt

🔧 Forum Members: Forum staff will be there - come say hi! 👋

🧰 Hands-On Engine Tuning Workshop

👨‍🏫 Instructors:
• Detailer Extraordinaire Lisa Wong
• Race Engineer Emily Torres

🔌 Hands-On Activities:
• Wiring harness fabrication
• 6-hour intensive training
• Personal coaching

📅 Skills Covered:
Color matching | Clear coat application | Scratch repair

🚙 May 12, 2026 at 10:00 AM (6-hour)

✨ Take home custom workshop manual!

Workshop: Hands-On Engine Tuning Workshop
Dyno Tuning Intensive Course

🏁 Dyno Tuning Intensive Course

🔧 Instructor: NASCAR Crew Chief Lisa Thompson

💻 Workshop Includes:
• Common tuning mistake avoidance
• 4-hour intensive hands-on training
• Fuel system upgrades | Injector sizing | Pump flow

📈 Bonus: Exclusive tuner network discounts

⏱️ Next Session: May 8, 2026 at 12:00 PM

Customize Your Tuning Focus:

🚀 Performance Mod Cost Estimator

Did you know? Proper tuning can add 20-30% more power from the same hardware

Vehicle Information

Modification Information

Additional Options

🔑 Car Key & Fob FAQ

Common questions about key programming, fob issues, and replacement options

Key Fob Issues
This typically indicates: weak fob battery (replace first), damaged fob antenna, or issues with your car's receiver (often in the door handle or rearview mirror). Environmental interference from other electronics can also reduce range.
Key Fob Issues
This typically indicates: weak fob battery (replace first), damaged fob antenna, or issues with your car's receiver (often in the door handle or rearview mirror). Environmental interference from other electronics can also reduce range.
Key Fob Issues
Many cars have a resync procedure: 1) Press lock/unlock buttons while near the car 2) Insert key and turn ignition on/off in a specific pattern 3) Use a sequence of button presses. Check your manual for exact steps - procedures vary widely by manufacturer.
Key Tip: Some locksmiths offer mobile key programming services
Security Systems
This means your car's immobilizer system can't read the key's transponder. Causes: dead key battery, damaged transponder chip, faulty car antenna ring around ignition, or system needs resetting. Try replacing the battery first.
Key Tip: Avoid exposing key fobs to water or extreme temperatures
Key Programming
Common reasons: wrong key type for your vehicle, anti-theft system needs reset, low car battery voltage during programming, or the key isn't properly synced. Some cars also have programming limits (only 2-4 keys can be registered).
Key Fact: Key fob batteries typically last 3-4 years with normal use

🔑 KEY SERVICES CLASSIFIEDS

Key Fob Repair & Battery Replacement
$25+
Posted: Apr 24, 2026
Fob not working? We fix broken buttons, replace batteries, and resync to your vehicle. Most repairs done while you wait. Water damage specialists available.
Call: 251-474-8642
Anti-Theft System Repair
$85+
Posted: Apr 24, 2026
Fixing security light issues, PATS systems, and ignition immobilizers. Proper diagnosis before repair. Most vehicles serviced same day. Warranty on all work.
Call: 411-432-8098
Fleet Key Programming
Call
Posted: Apr 20, 2026
Commercial key services for businesses with multiple vehicles. Bulk discounts available. We can handle all your company cars, trucks, and fleet vehicles.
Call: 950-878-0314
Vintage Car Key Restoration
$55+
Posted: Apr 28, 2026
Specializing in classic car keys (pre-1990). Can reproduce hard-to-find keys for antique vehicles. Museum-quality work for collector cars.
Call: 580-400-0996
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Seminar
May 19, 2026

Smart Key Programming Class

by VIN Decoder Pros
Learn dealer-level programming techniques normally only available at franchise shops
Seminar
May 12, 2026

Key Fob Repair Training

by Fob Fixers
Live demonstration of the latest anti-theft technologies and bypass prevention methods
Workshop
May 3, 2026

Smart Key Programming Class

by Locksmith Pro
Learn dealer-level programming techniques normally only available at franchise shops
Seminar
May 17, 2026

VIN Decoding Workshop

by Fob Fixers
Become certified in vehicle security systems with our intensive 2-day course

Need immediate service? Call our 24/7 hotline: 1-800-KEY-HELP

Want to list your key service? Join our provider network

Last posts on the forum