Can’t get rid off f Number plate bulb warning message

jshodgson

Active Member
Joined
Aug 25, 2017
Messages
116
Location
Torquay UK
Car
E class 320 cdi sport 2007
Warning came up on my dash to say the right side number plate bulb was faulty. Took out the bulb and it was black. Bought a replacement at Europarts (239 bulb) and fitted it and it works nicely but the warning message won’t go away. Any ideas?
 

mersum1es

MB Enthusiast
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Aug 9, 2012
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1,727
Location
Finland
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W212, C219
Can't remember which models had feature, where you need to 'reset' it by turning light switch '0' and then back to auto (or on). Are you sure you have right wattage bulb.
 

KennyN

MB Enthusiast
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Sep 21, 2014
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Paisley
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Me - BMW 440i Coupe / Dog -Cayenne
Have you replaced it with an LED bulb , if so that maybe your problem.

K
 

Deesidecars7

New Member
Joined
Oct 24, 2016
Messages
28
Car
320 M class, E class
had this problem for a year or more, i swapped out the complete bulb holder with new ones from MB, problem sorted, message never came on since
 

wrdcc01

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Mar 23, 2008
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196
Location
Crystal Palace
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1994 W124 E280 saloon M104.942 4s-auto, 72 Hillman Hunter GLS, 71 GPO Minor LCV.
Change both plate lamps as some bulb failure circuits compare balance between pairs of lamps.
 
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jshodgson

jshodgson

Active Member
Joined
Aug 25, 2017
Messages
116
Location
Torquay UK
Car
E class 320 cdi sport 2007
It cleared itself a day after the bulb was changed so all good now but I’ve bought another bulb to try wrdcc01’s trick if it happens again. Thanks all
 

AndrewOl

Active Member
Joined
Apr 1, 2017
Messages
454
Location
Romsey
Car
E350 A207
The control system sends a little pulse to each light circuit to check that the lamp circuit is complete. If the resistance of the circuit is higher than expected this can trick the control system into thinking the lamp is blown. Resistance usually builds up on the contacts for the lamp. A gentle rub with emery paper will remove any oxidation. Check the contacts have not been pushed back and have plenty of spring in them to make a good contact. If you can’t access the contacts a spray with electrical contact cleaner will help.
 

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