P0131-O2 Sensor 1/1 Voltage Low; P0137-O2 Sensor 1/2 Voltage Low - Chrysler Pacifica CS 2004 Service Manual

Symptom List:

P0131-O2 SENSOR 1/1 VOLTAGE LOW

P0137-O2 SENSOR 1/2 VOLTAGE LOW

Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0131-O2 SENSOR 1/1 VOLTAGE
LOW.
When Monitored and Set Condition:
P0131-O2 SENSOR 1/1 VOLTAGE LOW
When Monitored: Engine Running.
Set Condition: The oxygen sensor signal voltage is below 2.402 volts for 9 seconds. Two
trip Fault.
P0137-O2 SENSOR 1/2 VOLTAGE LOW
When Monitored: Engine Running.
Set Condition: The oxygen sensor signal voltage is below 2.402 volts for 9 seconds. Two
trip Fault.
O2 SENSOR BELOW 1.5 VOLTS
O2 SENSOR
O2 RETURN CIRCUIT SHORTED TO GROUND
O2 SIGNAL CIRCUIT SHORTED TO GROUND
O2 SIGNAL CIRCUIT SHORTED TO O2 RETURN CIRCUIT
O2 SIGNAL SHORTED TO HEATER GROUND CIRCUIT
PCM RETURN CIRCUIT
PCM SIGNAL CIRCUIT
POSSIBLE CAUSES
89
DRIVEABILITY - NGC