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Hello and welcome to just answer and allowing me to assist you. the problem code P1131 is for the upstream A/F sensor P1131 Possible causes:fuel system these are possible causes but in your situation I would try a good injector flush or cleaner like LUCAS INJECTOR CLEANER. to see if that will settle it down or you may have to replace it. The other code P000 Is not listed and could very well be a generic incomplete search by the ECU When you erase the codes it probably won't return.- excessive fuel pressure- leaking fuel injector(s)- leaking fuel pressure regulator- low fuel pressure or running out of fuel- contaminated fuel injector(s)- vapor recovery systeminduction system- air leaks after the maf.- vacuum leaks (lines or gaskets)- restricted air inlet- pcv system- vapor recovery systemegr system- leaking gasket- stuck open egr valve- leaking diaphragmbase engine- oil overfill- cam timing- cylinder compression- exhaust leaks before or near the HO2Ss* check intake air systems for leaks, obstruction or damage* check air cleaner element, air cleaner housing for blockage* verify integrity of the pcv system* check for vacuum leaks P0131 Upstream Heated Oxygen Sensor circuit out of range - Bank No. 1. Hope this helps your problem and if you need further assistance I'll be happy to do so. Please give my answer a pos ratting, thank you.