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Recently I had my car in for a major service and the technician or car mechanic spotted that my idle pulleys where corroded and the bearings had gone. In total, I have had all three idle pulleys replaced and to my surprise, it has fixed the rattling sound after 30 mins of driving in low gear. Amazing, even Toyota didn't know what to think about it.
The car mechanic was surprised that the idle pulley bearing had gone after 30,000 KLM, but it did and now I have no strange rattle noise.
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