E-Class (W211) 2003-2009

W211 e320 cdi ABS ESP BAS Fault

Old Mar 26, 2011 | 03:01 PM
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w211 E320 CDi
W211 e320 cdi ABS ESP BAS Fault

I have just purchased a 2003 W211 320 CDi

A couple of times the car hase had the ABS ESP & BAS lights come on and for a few seconds the car looses power shows these 3 malfunctions and then carries on as normal.

Once the car had all these faults come up and it died and would not restart. After recovering it back to the garage I bought it from they thought that the fault was with a faulty alternator so replaced it.

I have checked the aux battery & that is OK, the main battery is OK but not fully charged. You can hear the brake pump going whilst driving but as I have not driven many of these models I am not sure if this is normal.

But the fault still persists, I will be taking it back again but has anyone got any idea's on what could be causing this fault.
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Old Mar 26, 2011 | 04:38 PM
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Aux battery in the engine compartment is there as a backup battery for your SBC brake system. If one disconnects the main battery these errors can happen. You might get this also b/c your battery isn't fully charged? You have a battery sensor attached to your positive lead on your main battery in the trunk and if the battery reaches a certain level the car shuts off electrical systems in 2 steps.
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