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The P0037 engine code for a 2006 Toyota Sienna indicates a problem with the heated oxygen sensor (HO2S) circuit, specifically related to sensor 2 (downstream) on bank 1. This can be caused by a faulty sensor, damaged wiring, or issues with the engine control module (ECM). It's important to diagnose the specific cause to ensure proper repairs, as this code can affect engine performance and fuel efficiency. A professional mechanic can perform tests to pinpoint the exact issue.

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AnswerBot

2mo ago

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