Unusual Engine Noise at Idle in 2019 Honda Civic
The engine is producing an abnormal noise while idling, which may indicate issues with accessory belts, pulleys, or the serpentine belt tensioner. This could also be related to a failing alternator, water pump, or a loose component.
Diagnosis Details
Possible Causes
Worn or misaligned serpentine belt causing squealing or chirping noise
Failing idler pulley or tensioner bearing producing a grinding or rattling sound
Loose or damaged engine accessory (alternator, water pump, A/C compressor) bearing noise
Related OBD-II Codes
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What You Should Do
Inspect the serpentine belt for cracks, glazing, or tension issues.
Check all pulleys for play or roughness by spinning them manually.
Listen for noise changes when turning the steering wheel or engaging A/C.
If noise persists, have a mechanic perform a stethoscope test to isolate the source.
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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.
