[Archived] Trying to get ignition working again on my 2012 Mercedes Benz S Class

4302 views - Last reply: January 07, 2025
This topic is closed for new replies.

Where do I get the key code for my 2012 Mercedes Benz S Class to make a spare key?

Hello! We've developed a VIN-based tool to help you get your key code for the 2012 Mercedes Benz S Class. Check it out here: VIN Key Code Generator.

Replies (5)

Appreciate any advice—my 2012 Mercedes Benz S Class won’t recognize the key.

My 2012 Mercedes Benz S Class needs a new key but I need the code first. Help!

Exactly what I was looking for to fix my 2012 Mercedes Benz S Class.

Can’t believe this worked on my 2012 Mercedes Benz S Class. Huge thanks!

This trick worked for my buddy's 2012 Mercedes Benz S Class. Giving it a go myself.

Check the news !

Drag Racing Championship
🚙 Local Meetup: Drag Racing Championship
The local meetup for serious enthusiasts

🏁 Where: Fairgrounds Parking Lot
📆 When: June 23 @ 11AM-8PM

Event features:
Burnout Contest | DJ Music | Vendor Booths

⚙️ Forum Members: First 50 forum members get free dash plaques! ✨

🔧 Suspension Setup Clinic

👨‍🔧 Instructors:
• Master Technician Carlos Rodriguez (20+ years experience)
• Detailer Extraordinaire Lisa Wong

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

📝 Skills Covered:
ECU mapping | Air/fuel ratios | Dyno tuning

🚗 June 15, 2026 at 11:00 AM (4-hour)

🔥 Network with fellow gearheads during breaks!

Workshop: Suspension Setup Clinic
Forced Induction Tuning Lab

🔋 Forced Induction Tuning Lab

🧰 Instructor: Factory ECU Engineer Dr. Sophia Chen

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

📉 Bonus: Access to tuning parameter database

🔌 Next Session: June 5, 2026 at 1:00 PM

Customize Your Tuning Focus:

🚀 Performance Mod Cost Estimator

Insight: Suspension mods should match your intended use (street vs track)

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).
Security Systems
Not recommended. Bypassing requires specialized knowledge and may violate anti-theft laws. Proper solutions: 1) Get correctly programmed keys 2) Replace faulty immobilizer components 3) Have dealer reset the system if keys are lost.
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.
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 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 Fact: Key fob batteries typically last 3-4 years with normal use

🔑 KEY SERVICES CLASSIFIEDS

Lost Car Key Replacement
$120+
Posted: May 18, 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: 356-895-1790
Car Key Extraction Service
$45+
Posted: May 23, 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: 817-488-8783
Vintage Car Key Restoration
$55+
Posted: May 19, 2026
Specializing in classic car keys (pre-1990). Can reproduce hard-to-find keys for antique vehicles. Museum-quality work for collector cars.
Call: 308-417-8008
Key Fob Case Replacement
$35
Posted: May 17, 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: 244-645-9808
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Seminar
Jun 17, 2026

Lost Key Solution Roadshow

by Locksmith Pro
In-depth class covering push-to-start systems and proximity key programming techniques
Seminar
Jun 10, 2026

Key Fob Repair Training

by VIN Decoder Pros
Hands-on training for programming transponder keys, smart keys, and fobs using professional tools
Workshop
Jun 3, 2026

VIN Decoding Workshop

by Auto Key Masters
Become certified in vehicle security systems with our intensive 2-day course
Workshop
Jun 7, 2026

Smart Key Programming Class

by Fob Fixers
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