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P0031 HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
Shorted low condition detected in the oxygen sensor 1/1 heater element control feedback sense circuit
Hope this helps
 

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Discussion Starter #3
thanks for the quick response, I'll replace the #1 o2 sensor and ck . again. the other 2 have been bypassed because of headers. dr.d
 

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glad to help out. hope it works out
 
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