Engine Compartment Noise at Idle in 2020 Toyota RAV4
Unusual noise from the engine compartment when idling or stopped may indicate a failing accessory belt, tensioner, or a minor engine component issue. It is not immediately critical but should be inspected to prevent further damage.
Diagnosis Details
Possible Causes
Worn or loose serpentine belt causing a squealing or chirping noise at idle.
Failing belt tensioner or pulley bearing producing a grinding or rattling sound.
Engine valve train noise (e.g., low oil level or hydraulic lash adjuster issue) causing a ticking sound.
Related OBD-II Codes
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What You Should Do
Check serpentine belt condition and tension; inspect pulleys and tensioner for play or noise.
Verify engine oil level and condition.
If noise persists, have a mechanic listen with a stethoscope to pinpoint the source.
Related Repairs
Estimated Repair Cost
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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.