Exhaust Noise at Idle - Toyota Tacoma 2020
An unusual noise from the exhaust system at idle in a 2020 Toyota Tacoma may indicate an exhaust leak, a failing catalytic converter, or a loose heat shield. The noise is often described as a ticking, hissing, or rattling sound.
Diagnosis Details
Possible Causes
Exhaust manifold gasket leak or cracked manifold – common on this model, causing a ticking noise at idle.
Loose or damaged heat shield – can rattle against the exhaust pipe at idle.
Failing catalytic converter – internal honeycomb may break apart, causing a rattling noise.
Related OBD-II Codes
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What You Should Do
Inspect the exhaust system for visible leaks, loose shields, or damage.
Check for soot around gaskets.
If noise persists, have a mechanic perform a smoke test or listen with a stethoscope to pinpoint 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.
