P0155-O2 Sensor 2/1 Heater Circuit Low: Notes

Fig 1: O2 Sensor Heaters Circuit Schematic

Courtesy of CHRYSLER LLC

1. When Monitored  : Engine Running and Heater duty cycle greater than 0%
2. Set Condition  : The PCM detects the O2 Heater voltage is out of acceptable range. Below 0.0926 volt.

For a complete Powertrain Control Module Circuit Diagram, refer to SCHEMATICS AND DIAGRAMS .