[Resolved] Trying to program a new key for my Audi S4 Cabriolet 42 quattro - where's the key code?

2418 views - Last reply: May 08, 2025
This topic is closed for new replies.

Where's the key code stored to program keys for a Audi S4 Cabriolet 42 quattro?

Hello! We've developed a VIN-based tool to help you get your key code for the Audi S4 Cabriolet 42 quattro. Check it out here: VIN Key Code Generator.

Replies (5)

My Audi S4 Cabriolet 42 quattro has the same problem—any luck getting the key code?

Just what I needed! My Audi S4 Cabriolet 42 quattro has been acting up lately.

Was about to tow my Audi S4 Cabriolet 42 quattro. Let me try this first.

Using this on my Audi S4 Cabriolet 42 quattro now. Hope it works.

Following this for my Audi S4 Cabriolet 42 quattro. Please update if it works!

Check the news !

Drag Racing Championship
🚗 Local Meetup: Drag Racing Championship
No trophies, just cool cars and cool people

📍 Where: Industrial Park
📅 When: May 16 @ 12AM-5PM

Event features:
Club Displays | Trunk Swap Meet

🔧 Forum Members: First 50 forum members get free dash plaques! 👋

🧰 Hands-On Engine Tuning Workshop

👨‍🏫 Instructors:
• Restoration Pro Alex Petrov
• Paint Specialist Sarah Chen

🔌 Hands-On Activities:
• Wiring harness fabrication
• 4-hour intensive training
• Personal coaching

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

🚙 May 8, 2026 at 10:00 AM (4-hour)

✨ Tools and materials provided - just bring your enthusiasm!

Workshop: Hands-On Engine Tuning Workshop
Forced Induction Tuning Lab

🚀 Forced Induction Tuning Lab

⚙️ Instructor: Suspension Guru Alex Petrov

📊 Workshop Includes:
• Track vs street setup comparisons
• 4-hour intensive hands-on training
• Cooling system optimization | Heat management

🔩 Bonus: Live Q&A replay available

🏎️ Next Session: May 7, 2026 at 2:00 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
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.
Key Programming
Some vehicles allow DIY key programming using specific sequences (like turning ignition on/off with original keys). However, most modern cars require specialized equipment only locksmiths or dealers have. Check your owner's manual for your specific model.
Key Tip: Replace key fob batteries every 1-2 years as preventative maintenance
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: Avoid exposing key fobs to water or extreme temperatures
Lost Keys
Dealerships can often cut keys using your VIN, but will require proof of ownership. This only works for original factory keys - aftermarket or previously replaced locks won't match. The key will still need programming to start the car if it has a transponder.
Key Tip: Consider key insurance for expensive smart keys
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.
Key Tip: Avoid exposing key fobs to water or extreme temperatures
Key Fact: Some luxury car keys can cost $800+ to replace at dealerships

🔑 KEY SERVICES CLASSIFIEDS

Lost Car Key Replacement
$120+
Posted: Apr 27, 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: 341-962-9817
Key Fob Repair & Battery Replacement
$25+
Posted: Apr 27, 2026
Fob not working? We fix broken buttons, replace batteries, and resync to your vehicle. Most repairs done while you wait. Water damage specialists available.
Call: 209-518-6053
Transponder Key Duplication
$65+
Posted: Apr 28, 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: 609-404-7795
Anti-Theft System Repair
$85+
Posted: Apr 28, 2026
Fixing security light issues, PATS systems, and ignition immobilizers. Proper diagnosis before repair. Most vehicles serviced same day. Warranty on all work.
Call: 289-825-4381
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Seminar
May 31, 2026

Mobile Key Programming Clinic

by Locksmith Pro
Hands-on experience with the newest transponder key cloning and programming equipment
Seminar
May 26, 2026

Transponder Key Tech Day

by Fob Fixers
Hands-on experience with the newest transponder key cloning and programming equipment
Seminar
May 5, 2026

Dealer-Level Programming Workshop

by Auto Key Masters
Comprehensive guide to troubleshooting and resetting immobilizer systems in modern vehicles
Workshop
May 6, 2026

Immobilizer System Seminar

by Locksmith Pro
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