Question 1

Are you licensed and insured to work on Mercedes-Benz vehicles?

Accepted Answer

Yes. EZ Car Keyz is fully licensed through the California Bureau of Security and Investigative Services (BSIS License LCO#6792) and carries full insurance. We are also NASTF Vehicle Security Professional certified, which means we have authorized access to the security codes and programming protocols needed for Mercedes vehicles. Mercedes key work is a specialty within automotive locksmithing. Multiple locksmiths in professional forums admit they avoid Mercedes EIS jobs because of the complexity. We do not avoid them. We specialize in them.

Question 2

How do I know you are not a scam locksmith?

Accepted Answer

Scam locksmiths target Mercedes owners specifically because they know you are stressed and the car is expensive. One owner described a locksmith who showed up, blamed "Mercedes ransomware," could not actually program the key, and the owner ended up paying $1,000 at the dealer for a Smart car key. Another locksmith forum post described a "new guy in town" who advertised Mercedes key work, pulled the EIS apart, failed the job, and turned a $400 fix into a $1,200 mess. A real Mercedes locksmith will quote a firm price for your 2004 Mercedes-Benz SL over the phone and tell you exactly what tools they use. We have over 100,000 followers across our YouTube and TikTok channels showing exactly how we do the work.

Question 3

Will the replacement key work exactly like the original?

Accepted Answer

Yes. When we program a Remote Head Key for your 2004 Mercedes-Benz SL, it communicates with your vehicle's EIS/EZS module the same way the factory key does. The engine starts, the doors lock and unlock, and keyless go functions work as expected. We test every key on the spot before we leave. One Mercedes owner had the dealer try three shop keys and two newly coded fobs before concluding the EIS was corrupt, costing them multiple visits and days of troubleshooting. We diagnose and verify everything in one visit.

Question 4

What battery does the 2004 Mercedes-Benz SL key fob use?

Accepted Answer

The 2004 Mercedes-Benz SL uses a CR2025 battery. We always install a fresh one when we make a replacement key. If you already have a key and the range seems short or the buttons are inconsistent, a dead battery is the most common cause. On Mercedes keyless go models, the car will display a specific "replace key battery" warning before the key stops being detected. It is a quick, cheap fix before assuming you need a full replacement.

Question 5

What happens if something goes wrong after you leave?

Accepted Answer

Every key we make comes with a warranty. If the key stops working, the remote functions drop, or anything is off, call us and we take care of it. We are a local business in Solana Beach, not a random call center sending whoever is closest. Mercedes owners describe the dealer experience as paying $600 to $1,500 and still having issues. One owner tried for almost two months to get a working key through the dealer because cases kept timing out. When you go through EZ Car Keyz, you have a real person and a real business standing behind the work.

2004 Mercedes-Benz SL
Key Replacement - Save vs Dealer in San Diego

Trusted by 1,000+ Drivers

2004 Mercedes-Benz SL
Key Options

Verified Pro vs Dealer Process

2004 Mercedes-Benz SL Remote Head Key Replacement - Fast, Affordable & Professional

Save vs the Dealer on Your Mercedes-Benz SL Key

Mercedes-Benz SL Rapid Response, Done Right

Certified and Five-Star Rated

Mercedes-Benz SL Mobile Service FAQ

Mercedes-Benz SL Key Service Areas

2004 Mercedes-Benz SL Key by Licensed Pros

2004 Mercedes-Benz SLKey Replacement - Save vs Dealer in San Diego

Trusted by 1,000+ Drivers

2004 Mercedes-Benz SLKey Options