I have a 2005 Lexus 330 ES. It used to be very quiet. It now runs very loud. Took it to two different shops (not dealer as I just relocated). Neither could find anything wrong. I know there is something as I now need to blast the radio just to hear it when driving. Any ideas??
It's likely the tires. The Bridgestone Turanza OEM tires were specially designed to reduce road noise, which can be an issue. If you're running a different brand of tire, then that may be the cause. Also, if one of the rear tires has an issue (e.g. uneven wear), that may also be the cause. Possible causes of uneven wear include worn rear struts, infrequent rotation, bent wheel, or wheel/tire out of balance. Wheels/tires need to be rebalanced occasionally - at least every 20k miles.
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