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So my 02 sentra (96k miles) has scanner codes: P0037 H02S Heater Control Circuit Low Bank 1 Sensor 2, P0051 H02S Heater Control Circuit Low Bank 2 Sensor 1, and P0057 H02S Heater Control Circuit Low Bank 2 Sensor 2. It shows each of these codes TWICE on my scanner, not sure if that matters but just throwing it out there.

I know these errors are for the O2 sensors in the exhaust, I have already checked the heated oxygen sensor 15amp fuse and it seems fine, not burnt or blown. My questions is I just wanted to know if there might possibly be something else generic causing this issue besides just the sensors, like something random. I figured I'd at least ask people who know more knowledge about these cars than myself first since some cars have little quirks to them like how older Miata likes to pop dash fuses when nearing redline on a 'healthy' alternator.

Another thing, does the 02 Sentra B15 motor only have 3 sensors in the exhaust or 4, so I know how many to buy.. Any recommendations? I usually purchase all my stuff through Advanced Auto because I get a military discount there, the rep at my local Autozone is usually an asshole about accepting my VA card so I just don't bother to deal with them..

Should I even bother replacing them? The car gets 32-33 mpg average atm and has no hesitation or idling issues, it's a standard transmission if that helps..
 

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Is it a ULEV?
 

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Looking at my 03 FSM, there is no P0051 or P0057 to reference under SULEV or ULEV 1.8, may have to look at the 02 FSM. One of the 1.8s has 4 sensors but I don't remember, either way it will eventually clog the cat(s) if not taken care of.
 

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Bank 2?
 

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Check the wiring on that lower O2 sensor... mine had a small cut through the sheathing and the ground wire-- caused by vibrations and subsequent rubbing against the metal clip holder.
Remove it and repair the wire-- any moisture getting in there will trip the 0037 error. If it's faulty, then you will have to replace it. It messes with the AF ratio if that error is present.
 
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