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Your vehicle has two O2 sensors, one up front, and one in the rear. Typically, this means that your car is running rich(not burning all of the fuel. I would first check for any codes(can be done at any auto parts store, Checker, Pep Boys, AutoZone...) then I would replace the front sensor. This is an easy fix!

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Q: What does O2 sensor heat curcuit malfunction bank 1 sensor 2 mean on a 2001 Mitsubishi Diamante?
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