P0133

Test 1 - 3:

Test 4 - 5:

SYMPTOM
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 O2 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