[Confirmed] 1991 BMW 850i repair stalled - missing immobilizer code

4175 views - Last reply: October 01, 2024
This topic is closed for new replies.

How to get my 1991 BMW 850i's key code to program replacement keys?

Hello! We've developed a VIN-based tool to help you get your key code for the 1991 BMW 850i. Check it out here: VIN Key Code Generator.

Replies (3)

Same issue here. Let’s hope it works for my 1991 BMW 850i.

I’ve got a 2012 1991 BMW 850i, would this method still work?

I can’t believe I found this. Been stuck with my 1991 BMW 850i too.

Check the news !

Drift Challenge Series
🚙 Local Meetup: Drift Challenge Series
Cruise-ins, burnouts, and good times

🏁 Where: Brewery District
📆 When: July 22 @ 12AM-5PM

Event features:
Poker Run | Scavenger Hunt

⚙️ Forum Members: Who's going? Sound off in the comments! ✨

🔩 Suspension Setup Clinic

👩‍🏭 Instructors:
• Master Technician Carlos Rodriguez (20+ years experience)
• Electronics Expert Priya Patel

⚙️ Hands-On Activities:
• Wiring harness fabrication
• 4-hour intensive training
• Personal coaching

📋 Skills Covered:
Paint decontamination | Polishing | Protective coatings

🏎️ July 29, 2026 at 12:00 PM (4-hour)

💡 Tools and materials provided - just bring your enthusiasm!

Workshop: Suspension Setup Clinic
Data Logging & Analysis Bootcamp

🚀 Data Logging & Analysis Bootcamp

⚙️ Instructor: Data Acquisition Expert Priya Patel

📊 Workshop Includes:
• Real-world case studies
• 6-hour comprehensive hands-on training
• Cooling system optimization | Heat management

🔩 Bonus: Personalized setup recommendation

🏎️ Next Session: July 29, 2026 at 4:00 PM

Customize Your Tuning Focus:

🚀 Performance Mod Cost Estimator

Remember: More power means you'll need better brakes and tires

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 Tip: Replace key fob batteries every 1-2 years as preventative maintenance
Key Fob Issues
1) Find the seam and pry open the fob (some have tiny screws) 2) Note battery orientation 3) Remove old battery (CR2032 is most common) 4) Insert new battery 5) Reassemble. Test all buttons - if issues remain, the fob may need reprogramming.
Security Systems
An anti-theft system that prevents the engine from starting unless it detects the correct transponder chip in the key. The chip sends a unique code to the car's computer when you turn the ignition. No match = no start, even with a physically matching key.
Key Tip: Consider key insurance for expensive smart keys
Security Systems
A flashing security light often indicates an immobilizer issue. Solid light suggests the system is armed but not recognizing your key. Causes: faulty key chip, damaged antenna ring, low battery, or system needs reprogramming.
Key Tip: Newer cars often require dealer programming for first key replacement
Key Programming
Most transponder keys and smart keys can be reprogrammed if they haven't been damaged. Basic mechanical-only keys (no chip) can't be reprogrammed - they must be physically cut to match your locks.
Key Tip: Consider key insurance for expensive smart keys
Key Fact: Key programming typically takes 15-30 minutes for professionals

🔑 KEY SERVICES CLASSIFIEDS

Key Fob Repair & Battery Replacement
$25+
Posted: Jul 13, 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: 364-651-2717
Transponder Key Duplication
$65+
Posted: Jul 7, 2026
Get spare keys made before you lose yours! Cuts and programs most transponder keys on the spot. Cheaper than dealerships. 15+ years experience.
Call: 607-716-4414
Anti-Theft System Repair
$85+
Posted: Jul 5, 2026
Fixing security light issues, PATS systems, and ignition immobilizers. Proper diagnosis before repair. Most vehicles serviced same day. Warranty on all work.
Call: 410-657-5738
Key Fob Case Replacement
$35
Posted: Jul 10, 2026
Cracked or damaged fob housing? We transfer your electronics to a new case. Multiple color options available. Most models in stock. 15-minute service.
Call: 626-752-0784
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Workshop
Aug 12, 2026

Car Security Certification Course

by Locksmith Pro
Comprehensive guide to troubleshooting and resetting immobilizer systems in modern vehicles
Seminar
Jul 19, 2026

Anti-Theft System Demonstration

by Car Key Solutions
Hands-on experience with the newest transponder key cloning and programming equipment
Seminar
Jul 16, 2026

Smart Key Programming Class

by Auto Key Masters
Comprehensive guide to troubleshooting and resetting immobilizer systems in modern vehicles
Workshop
Aug 3, 2026

Key Fob Repair Training

by Locksmith Pro
Solutions for when all keys are lost - from code pulling to immobilizer resets

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