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Hi,

I have these error messages - Active Blind Spot Assist and Active Lane Keeping Assist Inoperable, along with PRE-SAFE functions limited see owners manual. My car is fitted with Distronic Plus.

I have had the system diagnosed tested at a local garage specialising in Mercedes. They say that the front nearside (passenger) radar sensor is faulty. However, I understand that the Blind Spot Assist is controlled by radar sensors at the rear.

I was thinking of purchasing a new radar sensor A0009058104 from ebay (from Germany) for £200. The garage wanted to charge my £480 for the sensor and £670 in total for installation

However, at the moment things just don't add up. Concerned that a fault will still be present after paying £670.

It would be good to know of a solution.

Regards John
 

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It has happened couple of times to my 2018 . It all comes back after restarting it.
Since it is still under extended warranty, maybe I should have them check it out.
 

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Reading elsewhere on this forum these messages can be caused by a faulty auxiliary battery. My GLC (warranty and service package expired) has been sat for long periods due to Covid. This auxiliary ‘battery’ is apparently a capacitator charged by the regenerative braking. With so little driving on mine these past three months there would be negligible recharging. I now have these error messages. I have a long trip planned in a weeks time which will give the auxiliary ‘battery’ plenty of opportunity to recharge. Option one is to replace the battery .. £100 plus and some contortionist work in the passenger footwell with risk of damaging trim parts. Option two is a £400 plus trip to merc dealer and waste of a day. (Prices from elsewhere on this site) Option three is the one I am taking .. do the very long drive (300+ miles) and see what happens. I will post the results.
 
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