Sweet Smell from Engine or Cabin While Driving or After Parking
A sweet smell in a 2019 Honda Civic, especially while driving or after parking, typically indicates a coolant leak. Coolant contains ethylene glycol, which has a sweet odor. This can lead to engine overheating and serious damage if not addressed promptly.
Diagnosis Details
Possible Causes
Coolant leak from radiator, hoses, water pump, or heater core
Heater core leak (sweet smell inside cabin)
Coolant reservoir cap failure or overflow
Related OBD-II Codes
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What You Should Do
Check coolant level in the reservoir and radiator (when engine is cold).
Look for visible leaks under the car, around hoses, radiator, and water pump.
If the smell is inside the cabin, inspect for wet carpets or foggy windows (heater core leak).
Do not drive if coolant is low or engine temperature rises.
Have the cooling system pressure tested by a mechanic.
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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.
