Auxiliary battery malfunction

paulr7

New Member
Joined
Feb 25, 2021
Messages
12
Location
Kent
Car
W205
Hi, just had my aux battery (voltage regulator) as the dealership call it changed under extended warranty, problem is the dealership informed me it has not cleared the message fault, and if I want them to see what’s causing the issue they want £160 an hour to fault find, just wondering if it’s a good drive could cure the issue, anyone else had this sort of experience after changing the regulator.
Definitely leave the car running for a good while after having the capacitor changed to charge it up.
Give it a good drive of an hour or so after letting the car idle for at least 30 minutes, the error should clear itself, if it doesn't then either the capacitor itself is still faulty or you might need to get the error reset but it's usually not a stored error but a live one iirc.
 

k.dawson1

Member
Joined
Mar 2, 2013
Messages
53
Location
Shelf, Halifax
Car
2016 C Class Sport Premium Plus
Definitely leave the car running for a good while after having the capacitor changed to charge it up.
Give it a good drive of an hour or so after letting the car idle for at least 30 minutes, the error should clear itself, if it doesn't then either the capacitor itself is still faulty or you might need to get the error reset but it's usually not a stored error but a live one iirc.
Thanks for the info Paul, you would think the dealership would know this and advise accordingly, but nothing surprises me these days with my dealership.
 
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hedgehogsdad

Active Member
Joined
Aug 8, 2018
Messages
91
Location
Chester
Car
Mercedes C63 AMG
Quick update.....

Given the car is mapped I didn't want to go to a Merc dealer, and so it's been into an indie in Chester today. They diagnosed that the aux battery (capacitor) was at fault and fitted a new on. £255 all in and no more messages (for now).

Thanks all for your help and advice
 

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