Fluid Leak Diagnosis - Brown/Black Puddle
A brown or black fluid puddle under a 2019 Nissan Altima typically indicates an oil leak (engine oil or transmission fluid). The color and consistency suggest it is not coolant or water, and the puddle size indicates a significant leak that should be addressed promptly to prevent engine or transmission damage.
Diagnosis Details
Possible Causes
Engine oil leak from drain plug, oil filter, or valve cover gasket
Transmission fluid leak from pan gasket, cooler lines, or seals
Power steering fluid leak (if equipped) or differential fluid leak (less common on Altima)
Related OBD-II Codes
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What You Should Do
Check fluid levels (engine oil and transmission fluid) immediately.
Inspect the leak location by placing cardboard under the car to identify the source.
If oil, tighten the drain plug or replace the oil filter.
If transmission fluid, check the pan gasket and lines.
Do not drive if fluid level is low to avoid engine or transmission failure.
Consult a mechanic for a thorough inspection.
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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.
