[Resolved] Need to program a key for my 1987 Mercedes Benz 300D but don’t have the code

4057 views - Last reply: October 30, 2024
This topic is closed for new replies.

Where's the key code located on a 1987 Mercedes Benz 300D for key programming?

Hello! We've developed a VIN-based tool to help you get your key code for the 1987 Mercedes Benz 300D. Check it out here: VIN Key Code Generator.

Replies (5)

Trying everything I can to get the key code for my 1987 Mercedes Benz 300D.

My 1987 Mercedes Benz 300D won’t budge without the code. Hoping this helps.

Why is finding a key code on a 1987 Mercedes Benz 300D this hard?!

Trying everything I can to get the key code for my 1987 Mercedes Benz 300D.

Anyone have luck with this on a 2015 1987 Mercedes Benz 300D?

Check the news !

JDM Enthusiasts Meet
🚗 Local Meetup: JDM Enthusiasts Meet
Where car culture comes alive in your community

📍 Where: Community College Campus
📅 When: May 20 @ 11AM-7PM

Event features:
Cruise Night | Raffle Prizes | Food Trucks

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

🔧 Off-Road Vehicle Build Day

👨‍🔧 Instructors:
• Paint Specialist Sarah Chen
• Suspension Guru David Klein

🛠️ Hands-On Activities:
• Live engine tuning session
• 4-hour intensive training
• Personal coaching

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

🚗 May 8, 2026 at 1:00 PM (4-hour)

🔥 Limited to 15 participants - reserve your spot now!

Workshop: Off-Road Vehicle Build Day
Forced Induction Tuning Lab

🔋 Forced Induction Tuning Lab

🧰 Instructor: Dyno Operator of the Year Dave Wilson

📱 Workshop Includes:
• Common tuning mistake avoidance
• 6-hour comprehensive hands-on training
• Turbo sizing | Intercooling | Wastegate control

📉 Bonus: Access to tuning parameter database

🔌 Next Session: May 12, 2026 at 4:00 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
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: Consider key insurance for expensive smart keys
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.
Cost & Options
You can buy fobs online, but: 1) Must match your exact model/year 2) Many still require professional programming 3) Cheap knockoffs may not work reliably. Some eBay/Amazon sellers offer programming instructions for DIY-friendly models.
Key Programming
Programming syncs the key's transponder chip with your car's immobilizer system. The process varies by manufacturer but generally involves: 1) authenticating with the car's computer 2) erasing old keys if needed 3) programming new key codes 4) testing functionality.
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: Avoid exposing key fobs to water or extreme temperatures
Key Fact: Modern transponder keys have been required in all new US vehicles since 1998

🔑 KEY SERVICES CLASSIFIEDS

Transponder Key Duplication
$65+
Posted: Apr 20, 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: 420-362-8338
Car Key Extraction Service
$45+
Posted: Apr 24, 2026
Broken key stuck in ignition or door? We can remove it without damage and make new keys same day. Emergency service available 24/7 for lockouts.
Call: 542-822-6598
Key Fob Case Replacement
$35
Posted: Apr 26, 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: 318-406-7347
Dealer Alternative Key Service
40% Less
Posted: Apr 24, 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: 453-583-8968
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Workshop
May 2, 2026

Car Security Certification Course

by Fob Fixers
Learn dealer-level programming techniques normally only available at franchise shops
Seminar
May 12, 2026

Transponder Key Tech Day

by Fob Fixers
Hands-on training for programming transponder keys, smart keys, and fobs using professional tools
Seminar
May 2, 2026

Dealer-Level Programming Workshop

by Fob Fixers
Hands-on training for programming transponder keys, smart keys, and fobs using professional tools
Seminar
May 10, 2026

Transponder Key Tech Day

by Auto Key Masters
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