DTC P0171, P0172, P0174 Or P0175: Fuel Trim System & DTC P1130, P1131, P1132, P1150, P1151 Or P1152: Ho2S Not Switching: Notes

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.