I am hearing a high pitches buzzing noise underneath the car. It’s more prominent on the passenger side near where the exhaust cats are when idling. Anyone have a clue on what could be making that noise?
Last edited by dcwang3; 07-02-2020 at 09:07 PM.
It could be your airpump running on, but there are no devices near the cats (heat).
You need to hunt a little more.
My suspicion is a failing fuel pump further back.
Could be a loose heat shield (broken weld) on the catalytic converter. Typical issue.
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