Fluid Leak Diagnosis
Brown/black fluid leaking from a 2019 BMW 3 Series, even in small amounts, typically indicates an oil leak from the engine or transmission. This requires prompt inspection to prevent further damage.
Diagnosis Details
Possible Causes
Engine oil leak from valve cover gasket or oil pan gasket
Transmission fluid leak from pan gasket or cooler lines
Differential fluid leak (if rear axle area)
Related OBD-II Codes
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What You Should Do
Check fluid color and smell: brown/black with burnt smell is oil; reddish-brown is transmission fluid.
Inspect undercarriage for source, check fluid levels, and clean area to monitor leak rate.
Schedule professional diagnosis soon.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
