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reading codes PO171 PO174 PO442 WHAT IS UPSTREAM OXEGEN SENSOR?
2 Replies
Up stream is referring to the oxygen sensor before the catalyst converter. I suggest you rear the article Fernando recommended,n O2 sensor will not likely fix these codes.
There is very good information on this site about those codes. I searched on the Encyclopedia and found http://repairpal.com/OBD-II-Code-P0171-and-P0174 and http://repairpal.com/OBD-II-Code-P0442