MERCEDES · DTC LOOKUP
Mercedes W211 EIS failure — W211 E-Class EIS authentication failure
Mercedes diagnostic code. Below: what it means, common causes, symptoms, and the exact bench-programming fix path.
Common causes
- •Aged EIS hardware
- •Key transponder failure
- •Internal cap degradation
- •Donor EIS installed
Symptoms you'll see
- •Crank-no-start
- •Intermittent recognition
- •"Key not recognized" cluster message
The fix path
Mercedes EIS Cloning ($250) — clone to a donor EIS + preserve your keys. Or EIS Key Replacement ($150) if you have working keys.
AML services that fix this
Mail in the affected module, we bench-program, ship back next business day. Flat pricing, return shipping included.
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Related diagnostic codes
U0001High Speed CAN Communication Bus ErrorSteering lock faultMercedes Electronic Steering Lock (ELV) failureEIS not reading keyMercedes EIS fails to authenticate inserted keyCrank-no-startEngine cranks normally but won't startAll keys lostNo working key for a European vehicleP164BEngine Stop Detected — Immobilizer ActivatedNot sure which service applies?
Text us your year/make/model + which scanner caught the code — we'll tell you exactly which module to ship and which service to pick.