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P0133

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE.

P0133


O2S Circuit. Slow Response. Sensor 1.


Fault symptoms


• CHECK ENGINE.


On-Board Diagnostics

Type of diagnosis:


- Test 1: Continuous. But interrupted when fault criteria fulfilled and does not restart until next driving cycle.

- Test 2: Once per driving cycle. Interrupted when fault criteria fulfilled or OK reported. Restarts next driving cycle.


Enable criteria:


- General conditions for this trouble code: When starting the engine, the atmospheric pressure must exceed 78 kPa and the engine coolant and intake air temperatures must exceed -7°C.

- Test 1: Engine running. Closed loop blocked in rich or lean position for a number of combustions to hold current from oxygen sensor 2 at 0.6 V. The required number of combustions is adapted.

- Test 2: 3 min. since engine started. Car stationary. Idle speed control active. Closed loop active and stable. Air mass/combustion stable. Purge active. Coolant temperature above 60°C. No change in brake light status. When all the conditions have been fulfilled, wait for 3 sensor transitions. Then count the number of combustions during 15 sensor transitions.


Fault criteria:


- Test 1: The adapted number of combustions during which closed loop is blocked in rich or lean position exceeds 50.

- Test 2: Number of combustions exceeding 460.


Dependents:


- P0116, P0117, P0118, P0131, P0132 and P0134.


System reaction to a fault:


- None.


OK report:


- Test 1: Number of adapted combustions has dropped at some time during the driving cycle. Test 2 performed once and fault criteria not fulfilled.


Fault handling: (See “Fault diagnosis, general” for more information.)


- Type III.


Diagnostic help

Fault diagnosis concerns an internal fault in the sensor.

Functions in the diagnostic tool related to the fault:


• Diagnostic status for the diagnosis.

• Oxygen Sensor Value, unit V.


See also the description of readings in ”Fault diagnosis, general” for more information.

Note

The oxygen sensor receives reference oxygen from the surrounding air via the connecting cables. For this reason, electrical contact spray or grease must not be used on the oxygen sensor connector.