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Hi guys Im still having some issues and dealership wont help much, their las diagnostic was loose ECU harness.
Theese are the symptoms:

Car is driveable 100%, but at some point it will show error messages in dashboard order is mostly this
1.- Collission Prevention Assist Plus Inoperative YELLOW MESSAGE
Automotive tire Motor vehicle Vehicle Automotive design Car



2.-Check break Fluid Level RED MESSAGE (Break fluid is at correct level)
Motor vehicle Trip computer Gauge Speedometer Vehicle



3.- See operator mannual with red battery logo RED MESSAGE (Baterry voltage constant 14.9V)
Vehicle Automotive design Car Motor vehicle Personal luxury car
Hood Output device Motor vehicle Vehicle Communication Device



4.- Also attention assits is inoperative
Brown Automotive tire Grey Personal luxury car Automotive design




I noticed when this error happens, front headlights flash one time, as if they turn off for .5sec maybe.
Charging system is ok accordfing to dealership and battery is 4 months old.

I attach some errors I got this morning from a generic OBD reader.
Font Screenshot Technology Software Gadget
Font Communication Device Gadget Screenshot Multimedia


If anyone has had this error or similar, I need some advice, as i said before, dealer is not helping much after 1 month testing.

Thank you all!
 

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Suggest:
a) Telephone 52-449-6393 This is MB Klasse and make a service appointment.
b) They are located at
Blvd. Luis Donaibo Colosio Murrieta 356
Valle De Las Trojes, 20115
Aguas calientes, Ags.,
c)Tell the Service Manager that the official Mercedes CLA.Org has recommended that you, (ammesago91) bring in your CLA200 to MB Klasse, to resolve and repair all of these issues and have asked you to also report back to us your level of satisfaction with the results.
d) If you have visited Klasse before, please tell us but continue with this plan with the Service Manager.
e) Other Members here may suggest additional recommendations.
f ) Come back here and let us know the results.
 

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...So far nor mechanic or dealer has suggested battery change
Several of us suggested replacements to you in August on our earlier thread.
 

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2021 AMG CLA 45 S Digital White w/Performance Package
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Yeah, I reckon its the old failing battery trick yet again. Make sure that you have both batteries checked, often its the Aux battery that causes a lot of weird error messages.
 
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