Symptom List:
P0133-O2 SENSOR 1/1 SLOW RESPONSE
P0139-O2 SENSOR 1/2 SLOW RESPONSE
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0133-O2 SENSOR 1/1 SLOW
RESPONSE.
When Monitored and Set Condition:
P0133-O2 SENSOR 1/1 SLOW RESPONSE
When Monitored: Start and drive vehicle greater than 20 MPH and less than 55 MPH.
Throttle open for a minimum 120 seconds. Coolant Temp greater than 70°C (158°F).
Catalytic Converter Temperature greater than 600°C (1112°F)
Set Condition: The PCM monitors the state of change of the front O2 sensor and the rear
02 sensor. The PCM will then compare the differences between both readings, if the
differences are greater than a calibrated amount the PCM will record a fault. Two trip
failure.
P0139-O2 SENSOR 1/2 SLOW RESPONSE
When Monitored: Start and drive vehicle greater than 20 MPH and less than 60 MPH.
Throttle open for a minimum 120 seconds. Coolant Temp greater than 70°C (158°F). RPM
between 1200 to 2000. Vacuum between 56Kpa to 28 Kpa.
Set Condition: The PCM monitors the state of change of the front O2 sensor and the rear
02 sensor. The PCM will then compare the differences between both readings, if the
differences are greater than a calibrated amount the PCM will record a fault. Two trip
failure.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
EXHAUST LEAK
O2 SIGNAL CIRCUIT
O2 RETURN CIRCUIT
O2 SENSOR
95
DRIVEABILITY - NGC
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