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02 sensor fault code

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165
Hi,

Got a primary 02 sensor fault code, car is currently running rough with bad idle, revs dropping when coming to a stop and slightly bad MPG. Fault code is P0131 - 02S(HO2S)(S1) Voltage Low.

Got a 4-2-1 race header and the original 02 sensors have been fitted back into the 02 sensor slots on the race header, have a K100 ECU and has been mapped. Was running fine until a few months ago and now the EML has come on throwing this fault code.

Would it just be matter of checking out the faulty sensor wiring, sensor etc and replacing it or would I need to fit 02 spacers as it is a race header?
 
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