How do you fix P1155 error code AF Ratio sensor in a Toyota RAV4 2003?
sensor, though it operates like one and in the same location(in exhaust stream). Basically the PCM detected that the heater circuit was drawing excessive amperage or no amperage. Usually it’s a bad a/f sensor and replacing it will fix it, however, it doesn’t rule out the possibility of damaged wiring or an open in the power or ground circuit, or a short in the power or ground circuit.
