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Both forward O2 sensors need to be replaced at the same time anyway, just replace both forward sensors and don't worry about which is which. You don't replace just the sparkplug that's misfiring, do you? Well, maybe you do, but it's the kind of thing that leaves you constantly working on your car. If one's gone bad the other is close behind.

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Q: Where is the o2 sensor heater circuit bank 1 sesnsor 1 located on a 2000 dodge durango?
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