[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 !

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

🗺️ Where: City Park Pavilion
⏰ When: May 29 @ 10AM-4PM

Event features:
Tech Sessions | DIY Demonstrations

🔩 Forum Members: Post your ride in our event discussion thread! 👍

🔩 Classic Car Restoration Workshop

👩‍🏭 Instructors:
• Restoration Pro Alex Petrov
• Electronics Expert Priya Patel

⚙️ Hands-On Activities:
• Ceramic coating application
• 4-hour intensive training
• Personal coaching

📋 Skills Covered:
Paint decontamination | Polishing | Protective coatings

🏎️ May 7, 2026 at 12:00 PM (4-hour)

💡 Limited to 15 participants - reserve your spot now!

Workshop: Classic Car Restoration Workshop
ECU Remapping Masterclass

🏁 ECU Remapping Masterclass

🔧 Instructor: Engine Builder Mike O'Connor (1000+ HP builds)

💻 Workshop Includes:
• Budget performance hacks
• 6-hour comprehensive hands-on training
• Cooling system optimization | Heat management

📈 Bonus: Custom tune file included

⏱️ Next Session: May 5, 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 Programming
Professional key programming requires: diagnostic tools to access the immobilizer system, key code software, transponder programmers, and often proprietary manufacturer equipment. Some locksmiths and all dealers have these tools.
Security Systems
Some systems reset by: 1) Disconnecting battery for 15+ minutes 2) Using original keys in specific sequences 3) Professional diagnostic reset. Consult your manual - procedures vary. Persistent issues may require dealer-level tools.
Key Tip: Newer cars often require dealer programming for first key replacement
Lost Keys
Yes, a skilled auto locksmith can extract the broken key and make a replacement. They can often do this without damaging the ignition cylinder. The new key will need programming if it has a transponder chip.
Key Tip: Consider key insurance for expensive smart keys
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.
Key Tip: Replace key fob batteries every 1-2 years as preventative maintenance
Key Fob Issues
Sometimes. Broken buttons can often be fixed by cleaning or replacing the button pad. Cracked cases can be glued. However, water damage or circuit board issues usually require complete fob replacement. Reprogramming is still needed for replacement fobs.
Key Tip: Consider key insurance for expensive smart keys
Key Fact: Some luxury car keys can cost $800+ to replace at dealerships

🔑 KEY SERVICES CLASSIFIEDS

Mobile Key Programming Service
$75+
Posted: Apr 22, 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: 756-288-4828
Transponder Key Duplication
$65+
Posted: Apr 24, 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: 581-882-1134
Vintage Car Key Restoration
$55+
Posted: Apr 27, 2026
Specializing in classic car keys (pre-1990). Can reproduce hard-to-find keys for antique vehicles. Museum-quality work for collector cars.
Call: 500-502-6265
Key Fob Case Replacement
$35
Posted: Apr 29, 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: 522-277-1937
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Seminar
May 2, 2026

Mobile Key Programming Clinic

by VIN Decoder Pros
Become certified in vehicle security systems with our intensive 2-day course
Seminar
May 29, 2026

Mobile Key Programming Clinic

by The Key Lab
Learn how to extract key codes from VIN numbers and decode vehicle security information
Seminar
May 3, 2026

Mobile Key Programming Clinic

by Locksmith Pro
Solutions for when all keys are lost - from code pulling to immobilizer resets
Workshop
May 22, 2026

VIN Decoding Workshop

by The Key Lab
Learn how to extract key codes from VIN numbers and decode vehicle security information

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