P0161-O2 Sensor 2/2 Heater Circuit Open: Notes

Fig 1: O2 Sensor Heaters Circuit Schematic

Courtesy of CHRYSLER LLC

When Monitored : Engine Running and Heater duty cycle greater than 0%.
Set Condition : O2 Heater Temperature does not reach 575°C (959°F) within 90 second during monitoring conditions. Two Trip Fault.

Possible Causes
O2 HEATER ELEMENT
FUSED ENGINE CONTROL RELAY OUTPUT CIRCUIT OPEN
O2 HEATER CONTROL CIRCUIT OPEN
POWERTRAIN CONTROL MODULE

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