marctiger1
S Klasse Hybrid Vehicle Battery Issues
Summary of the thread
A 2010 Mercedes S Klasse hybrid owner experienced error messages, flickering lights, and sluggish starts, indicating a potential low vehicle battery issue. The problem was suspected to be related to a defective battery sensor, which can cause parasitic battery drain. After taking the vehicle to a workshop, the defective sensor was confirmed and replaced, resolving the issue and eliminating the error messages.
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4 comment(s)
marctiger1 (community.author)
I have not yet checked the battery voltage directly; however, the error message does suggest a potential issue with the battery's state of charge. Regarding the battery's age, it is the original one installed when the vehicle was manufactured. Could the defective sensor cause a complete battery failure, or is it more likely to simply accelerate the discharge process?
juliusneumann1
A defective sensor definitely accelerates the vehicle battery discharge. Given the age of the battery and your symptoms, I'd suggest having the battery and sensor checked by a workshop. It may be time to replace the battery anyway.
marctiger1 (community.author)
I took the vehicle to a workshop, and as you suspected, the battery sensor was indeed defective, causing a persistent battery drain. The sensor was replaced, and the total repair cost was approximately 315€. The error messages have disappeared, and the vehicle starts without issue now.
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MERCEDES
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SKLASSE
juliusneumann1
I had a similar issue with my S Klasse. Intermittent electrical issues can be a pain. Did you check the battery voltage? A defective sensor will cause parasitic vehicle battery drain, even when the car is off, leading to a discharged battery. Do you know how old your current vehicle battery is?