[Free Fix] 1985 Mercedes Benz 500SEL stopped working after jump-start - immobilizer?

2358 views - Last reply: December 13, 2024
This topic is closed for new replies.
Techlord
Member since February 2023 • 12 posts

Where can I locate the key code to program a 1985 Mercedes Benz 500SEL key?

Posted on December 13, 2024
Adminbot
Staff Member • 628 posts

Hello! We've developed a VIN-based tool to help you get your key code for the 1985 Mercedes Benz 500SEL. Check it out here: VIN Key Code Generator.

Posted on December 14, 2024

Replies (4)

Quantumx
Member • 46 posts

Following along—same issue with my 1985 Mercedes Benz 500SEL.

December 14, 2024 Reply
Crazycat
Member • 70 posts

Great info! Needed this for my old 1985 Mercedes Benz 500SEL.

December 15, 2024 Reply
Xenonflash
Member • 67 posts

Will this work if the 1985 Mercedes Benz 500SEL has an aftermarket alarm?

December 16, 2024 Reply
Aceventura
Member • 109 posts

Bookmarking this for when I work on my 1985 Mercedes Benz 500SEL this weekend.

December 17, 2024 Reply

Check the news !

Import Car Festival
🚗 Local Meetup: Import Car Festival
From daily drivers to show queens

📍 Where: Industrial Park
📅 When: June 9 @ 10AM-5PM

Event features:
Cruise Night | Raffle Prizes | Food Trucks

🔧 Forum Members: Post in the thread to reserve your spot! 👋

🔩 Classic Car Restoration Workshop

👩‍🏭 Instructors:
• Custom Fabricator Mike 'Wrench' O'Connor
• Race Engineer Emily Torres

⚙️ Hands-On Activities:
• Panel beating and dent repair
• 6-hour intensive training
• Personal coaching

📋 Skills Covered:
Metal finishing | Bondo application | Rust treatment

🏎️ May 22, 2026 at 12:00 PM (6-hour)

💡 Limited to 15 participants - reserve your spot now!

Workshop: Classic Car Restoration Workshop
Carburetor to EFI Conversion Clinic

🚀 Carburetor to EFI Conversion Clinic

⚙️ Instructor: Classic Muscle Tuner Tom 'Torque' Jenkins

📊 Workshop Includes:
• Data interpretation techniques
• 6-hour comprehensive hands-on training
• Turbo sizing | Intercooling | Wastegate control

🔩 Bonus: Personalized setup recommendation

🏎️ Next Session: May 23, 2026 at 4:00 PM

Customize Your Tuning Focus:

🚀 Performance Mod Cost Estimator

Warning: Cheap parts often cost more in the long run due to failures

Vehicle Information

Modification Information

Additional Options

🔑 Car Key & Fob FAQ

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

Lost Keys
1) Contact a locksmith who specializes in automotive keys or your dealership 2) Provide proof of ownership (registration, title, ID) 3) They'll either cut new keys by code or reprogram your car's system 4) This is expensive ($200-$800) as the immobilizer may need resetting.
Lost Keys
Locksmiths or dealers can: 1) Decode your door or ignition lock to determine key cuts 2) Access your car's key code through manufacturer databases (with proof of ownership) 3) Program new transponder keys using diagnostic equipment.
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 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.
Lost Keys
Costs vary widely: Basic keys: $50-$150, Transponder keys: $150-$300, Smart keys/fobs: $200-$800, Dealership replacements typically cost 20-50% more than locksmiths. Emergency/lockout service adds $50-$150.
Key Tip: Newer cars often require dealer programming for first key replacement
Key Fact: Many cars can store up to 8 different key codes in memory

🔑 KEY SERVICES CLASSIFIEDS

Mobile Key Programming Service
$75+
Posted: May 11, 2026
Professional car key programming for most makes/models. We come to you! Transponder keys, fobs, and smart keys. Same-day service available. All work guaranteed.
Call: 437-250-4014
Lost Car Key Replacement
$120+
Posted: May 10, 2026
Lost all your keys? We can cut and program new ones even without originals. Dealership alternative at 40% less. Proof of ownership required. Serving all major brands.
Call: 954-877-9885
Fleet Key Programming
Call
Posted: May 9, 2026
Commercial key services for businesses with multiple vehicles. Bulk discounts available. We can handle all your company cars, trucks, and fleet vehicles.
Call: 842-853-5987
Key Fob Case Replacement
$35
Posted: May 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: 803-434-3563
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Seminar
May 16, 2026

Car Security Certification Course

by Car Key Solutions
Become certified in vehicle security systems with our intensive 2-day course
Seminar
May 16, 2026

Anti-Theft System Demonstration

by Locksmith Pro
Learn dealer-level programming techniques normally only available at franchise shops
Workshop
May 27, 2026

Transponder Key Tech Day

by Car Key Solutions
Comprehensive guide to troubleshooting and resetting immobilizer systems in modern vehicles
Seminar
Jun 9, 2026

Immobilizer System Seminar

by Mobile Key Tech
Comprehensive guide to troubleshooting and resetting immobilizer systems in modern vehicles

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