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I've seen plastic bags get stuck to exhaust systems several times. Once you heat up the exhaust it starts to melt and smell.
Toyota recommends: 5W-30 2001-2009 0W-20 (only comes in synthetic) 2010 and up I use 0W-30 (Mobil1) on my 2005.
Did they tell you what the code was?
You don't need to pay, plenty of good looking women love Prii.