[Recommended Fix] My MercedesBenz EClass 350 Sedan fob is dead - can’t find transponder code

1488 views - Last reply: May 11, 2025
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Trying to program a spare key - need the key code for my MercedesBenz EClass 350 Sedan

Hello! We've developed a VIN-based tool to help you get your key code for the MercedesBenz EClass 350 Sedan. Check it out here: VIN Key Code Generator.

Replies (6)

Will this work for older MercedesBenz EClass 350 Sedans? Mine's a 2009.

I’ve got a 2012 MercedesBenz EClass 350 Sedan, would this method still work?

I think my MercedesBenz EClass 350 Sedan has the same issue. Good to know I'm not alone.

My MercedesBenz EClass 350 Sedan might finally get back on the road thanks to this.

Fingers crossed this works for my MercedesBenz EClass 350 Sedan too.

Just wanted to say this guide helped with my MercedesBenz EClass 350 Sedan!

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Key Programming
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Key Tip: Consider key insurance for expensive smart keys
Key Programming
Most transponder keys and smart keys can be reprogrammed if they haven't been damaged. Basic mechanical-only keys (no chip) can't be reprogrammed - they must be physically cut to match your locks.
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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.
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Security Systems
A flashing security light often indicates an immobilizer issue. Solid light suggests the system is armed but not recognizing your key. Causes: faulty key chip, damaged antenna ring, low battery, or system needs reprogramming.
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