how would i know??

P.O.E.T.

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P0031 HO2S Heater Control Circuit Low (Bank 1 Sensor 1)

my p5 is trowing that code above how would i know what O2 sensor is the faulty one...the one above or below the header?

what's bank 1 sensor 1?
 
if the o2 sensor is really messed up the ecu will not be able to make proper air fuel trims and the car will operate in a 'limp mode' more than likely, just enough to run the engine safely and move the car around.
 

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