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For some odd reason, the 2007 MY Canadian-made RX350 recommends DENSO 2349049 for the Bank 2 Sensor 1 (Upstream) 02. I decided to pay half the price and get DENSO 2349008 instead which is for the Japan-made RX and is recc for 08-09 Canadian-made. Well, after the install, this 2007 RX is running like a top, no more stumbling, running rich and check engine light!