Q: What is causing the rattle in the component just under the alternator? on 2005 Scion xB

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Not too long ago a rattle developed in the engine. I purchased a mechanics stethoscope and I think I have isolated the rattle as coming from the component just under the alternator. I have purchased a Scion xb maintenance manual, but it does not come in until tomorrow. Thanks
(2) Answers
What did your maintenance manual book say about the rattling? Mine does this as well. Do the motor mounts need replacing?