EZS Replacement Failure
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EZS Replacement Failure
Hi there,
I have a 2017 E220d and the car refused to start late December. An auto electrician has been working on it and narrowed it down to the EZS.
The EZS was replaced this week (with an official one from MB in Germany) and the car started. However, when the car was locked and returned to later in the day the car refused to start again so back to square one.
We are at a bit of a loss as it would seem unusual for the new EZS to be blown up so to speak? It was programmed with Xentry. The car is also showing no error codes at all so thinks its fine and ready to drive.
Does anyone possibly have any suggestions on what I could pass to the auto electrician?
As next steps the auto electrician is going to start again and go through all the diagnosis steps again. They work on Mercedes daily and havent seen this happen before.
Any advice would be absolutely amazing as the cars been off the road for nearly two months and I really dont want to have to take it to main dealer as the bill will be horrendous! And when they cant solve tricky electrical issues, they send the cars to him anyway!
Thank you so much for reading
Adam
I have a 2017 E220d and the car refused to start late December. An auto electrician has been working on it and narrowed it down to the EZS.
The EZS was replaced this week (with an official one from MB in Germany) and the car started. However, when the car was locked and returned to later in the day the car refused to start again so back to square one.
We are at a bit of a loss as it would seem unusual for the new EZS to be blown up so to speak? It was programmed with Xentry. The car is also showing no error codes at all so thinks its fine and ready to drive.
Does anyone possibly have any suggestions on what I could pass to the auto electrician?
As next steps the auto electrician is going to start again and go through all the diagnosis steps again. They work on Mercedes daily and havent seen this happen before.
Any advice would be absolutely amazing as the cars been off the road for nearly two months and I really dont want to have to take it to main dealer as the bill will be horrendous! And when they cant solve tricky electrical issues, they send the cars to him anyway!
Thank you so much for reading
Adam
Last edited by AddyT; Feb 22, 2026 at 06:34 AM.
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Hi there,
I have a 2017 E220d and the car refused to start late December. An auto electrician has been working on it and narrowed it down to the EZS.
The EZS was replaced this week (with an official one from MB in Germany) and the car started. However, when the car was locked and returned to later in the day the car refused to start again so back to square one.
We are at a bit of a loss as it would seem unusual for the new EZS to be blown up so to speak? It was programmed with Xentry. The car is also showing no error codes at all so thinks its fine and ready to drive.
Does anyone possibly have any suggestions on what I could pass to the auto electrician?
As next steps the auto electrician is going to start again and go through all the diagnosis steps again. They work on Mercedes daily and havent seen this happen before.
Any advice would be absolutely amazing as the cars been off the road for nearly two months and I really dont want to have to take it to main dealer as the bill will be horrendous! And when they cant solve tricky electrical issues, they send the cars to him anyway!
Thank you so much for reading
Adam
I have a 2017 E220d and the car refused to start late December. An auto electrician has been working on it and narrowed it down to the EZS.
The EZS was replaced this week (with an official one from MB in Germany) and the car started. However, when the car was locked and returned to later in the day the car refused to start again so back to square one.
We are at a bit of a loss as it would seem unusual for the new EZS to be blown up so to speak? It was programmed with Xentry. The car is also showing no error codes at all so thinks its fine and ready to drive.
Does anyone possibly have any suggestions on what I could pass to the auto electrician?
As next steps the auto electrician is going to start again and go through all the diagnosis steps again. They work on Mercedes daily and havent seen this happen before.
Any advice would be absolutely amazing as the cars been off the road for nearly two months and I really dont want to have to take it to main dealer as the bill will be horrendous! And when they cant solve tricky electrical issues, they send the cars to him anyway!
Thank you so much for reading
Adam
> Tell him to... :
-- Focus on the "DRIVE AUTHORIZATION" Status
-- Follow Xentry guided troubleshooting steps.
Provide test result data to further help you.
> Side notes:
Don't ignore the "brake switch:ON" condition.
The initial issue may not have been the module that was replaced so these next steps are making this obvious.
Are charges for rushed diagnosis discounted or extra?
Last edited by CaliBenzDriver; Feb 23, 2026 at 03:55 PM.
