[Update] OBD tools that read key code for 1991 Mercedes Benz SL500

2572 views - Last reply: May 09, 2025
This topic is closed for new replies.
Xfactor
Member since November 2021 • 42 posts

How do I find the key code to program a key for my 1991 Mercedes Benz SL500?

Posted on May 09, 2025
Adminbot
Staff Member • 894 posts

Hello! We've developed a VIN-based tool to help you get your key code for the 1991 Mercedes Benz SL500. Check it out here: VIN Key Code Generator.

Posted on May 10, 2025

Replies (6)

Jokersmile
Member • 86 posts

I think my 1991 Mercedes Benz SL500 has the same issue. Good to know I'm not alone.

May 10, 2025 Reply
Yellowjacket
Member • 16 posts

Just wanted to say this guide helped with my 1991 Mercedes Benz SL500!

May 11, 2025 Reply
Titanium
Member • 112 posts

If this works for my 1991 Mercedes Benz SL500, I owe you big time.

May 12, 2025 Reply
Icedragon
Member • 83 posts

Bookmarking this for when I work on my 1991 Mercedes Benz SL500 this weekend.

May 13, 2025 Reply
Urbanlegend
Member • 140 posts

My mechanic said this might help with my 1991 Mercedes Benz SL500 key issue.

May 14, 2025 Reply
Titanium
Member • 99 posts

I’ll try this and update how it goes with my 1991 Mercedes Benz SL500.

May 15, 2025 Reply

Check the news !

Car Audio & Customization Show
🏎️ Local Meetup: Car Audio & Customization Show
Cruise-ins, burnouts, and good times

🗺️ Where: Regional Airport (static display area)
⏰ When: June 14 @ 10AM-4PM

Event features:
Club Displays | Trunk Swap Meet

🔩 Forum Members: Special section just for forum members! 👍

🔩 Detailing Like a Pro

👩‍🏭 Instructors:
• Safety Inspector Robert Yang
• Suspension Guru David Klein

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

📋 Skills Covered:
Torque specs | Bleeding procedures | Pad selection

🏎️ May 24, 2026 at 9:00 AM (4-hour)

💡 Lunch and refreshments included!

Workshop: Detailing Like a Pro
ECU Remapping Masterclass

🔋 ECU Remapping Masterclass

🧰 Instructor: Suspension Guru Alex Petrov

📱 Workshop Includes:
• Real-world case studies
• 6-hour comprehensive hands-on training
• Traction control tuning | Launch control setup

📉 Bonus: Certificate of completion

🔌 Next Session: May 29, 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

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 Tip: Some locksmiths offer mobile key programming services
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
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: Avoid exposing key fobs to water or extreme temperatures
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.
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 Fact: Some luxury car keys can cost $800+ to replace at dealerships

🔑 KEY SERVICES CLASSIFIEDS

Mobile Key Programming Service
$75+
Posted: May 14, 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: 950-827-7921
Transponder Key Duplication
$65+
Posted: May 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: 881-441-3428
Key Fob Case Replacement
$35
Posted: May 13, 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: 633-915-0015
Dealer Alternative Key Service
40% Less
Posted: May 11, 2026
Same quality as dealership without the markup. We have the same programming tools but charge significantly less. All major European, Asian, and domestic brands.
Call: 447-260-2126
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Seminar
May 19, 2026

Mobile Key Programming Clinic

by Locksmith Pro
Learn dealer-level programming techniques normally only available at franchise shops
Workshop
Jun 10, 2026

Lost Key Solution Roadshow

by Locksmith Pro
Hands-on experience with the newest transponder key cloning and programming equipment
Workshop
May 28, 2026

Transponder Key Tech Day

by Fob Fixers
Learn dealer-level programming techniques normally only available at franchise shops
Seminar
May 25, 2026

Transponder Key Tech Day

by VIN Decoder Pros
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