P0133

CIRCUIT DESCRIPTION
The powertrain control module (PCM) continuously monitors the heated oxygen sensor (HO2S 1) activity for 100 seconds. During the monitor period, the PCM counts the number of times that the HO2S 1 switches from rich to lean and from lean to rich and adds the amount of time that the HO2S 1 took in order to complete all of the switches. With this information, you can determine an average time for all of the switches. If the average time to switch is too slow, a DTC P0133 will set.

Do not attempt to repair the HO2S. Replace the entire HO2S if the following conditions exist:
^ Damaged wiring
^ Damaged electrical connector
^ Damaged terminals

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0105, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0336, P0440, P0446, P0452, P0453, P0507, P0601, P0602, P0604, P0606, P1120, P1220, P1221, P1271, P1275, P1280, P1484, P1512, P1514, P1515, P1516, P1621, P1635, P1639, P1680, or P1681 are not set.
^ The fuel level sensor is more than 10 percent.
^ The engine coolant temperature (ECT) sensor is more than 70°C (158°F).
^ The engine speed is between 1,450-1,900 RPM.
^ The loop status is closed.
^ The throttle position (TP) indicated angle is between 25-30 percent.
^ The evaporative emission (EVAP) purge solenoid command is more than 10 percent.
^ The above conditions have been met for 30 seconds.

CONDITIONS FOR SETTING THE DTC
The average HO2S 1 response times are more than 850 mS for rich to lean sweeps or 950 mS for lean to rich sweeps or the sum of rich to lean and lean to rich sweeps is more than 2100 mS.

ACTION TAKEN WHEN THE DTC SETS
^ The malfunction indicator lamp (MIL) will illuminate after two consecutive ignition cycles in which the diagnostic runs with the malfunction present.
^ The PCM will record the operating conditions at the time that the diagnostic fails. This information will store in the Freeze Frame/Failure Records buffers.
^ A history DTC stores.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The MIL will turn OFF after three consecutive ignition cycles in which the diagnostic runs without a fault.
^ A history DTC will clear after 40 consecutive warm up cycles without a fault.
^ Use a scan tool to clear the DTCs.

TEST DESCRIPTION

DTC P0133 - Steps 1-8:

DTC P0133 - Steps 9-14:

The numbers below refer to the step numbers on the diagnostic table.
2. When the system is operating correctly, the HO2S voltage should toggle above and below the specified values.
5. The specified value is what is measured on a correctly operating system.
6. The specified value is what is measured on a correctly operating system.