DTC P0141 - Right Rear Oxygen Sensor Heater Malfunction: Condition

WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.

DTC is set when ECM voltage is greater than 11.5 volts when voltage is supplied to right rear oxygen sensor heater. When ECM voltage is less than 5.8 volts when no voltage is supplied to right rear oxygenn sensor.

Open circuit between terminal No. 3C on Engine Control Module (ECM) and terminal "D" (Black/Red wire) on right rear oxygen sensor.