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According to AllData.......


DTC P1133



Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The powertrain control module (PCM) supplies the HO2S with a reference, or bias, voltage of about 450 mV . When the engine is first started the PCM operates in open loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and closed loop is achieved, the HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream; low HO2S voltage indicates a lean exhaust stream. This diagnostic will only run once per ignition cycle. The PCM monitors the number of rich to lean and lean to rich transitions. If the PCM detects that the number of transitions were less than a specified value, DTC P1133 sets for HO2S bank 1 sensor 1 or DTC P1153 sets for HO2S bank 2 sensor 1.



This diagnostic procedure supports the following DTCs:



DTC P1133 HO2S Insufficient Switching Bank 1 Sensor 1

DTC P1153 HO2S Insufficient Switching Bank 2 Sensor 1





DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0128, P0131, P0132, P0134, P0135, P0151, P0152, P0154, P0155, P0169, P0178, P0179, P0200, P0220, P0442, P0446, P0452, P0453, P0455, P0496, P1125, P1258, P1516, P2101, P2108, P2135, U0107 are not set.

The ECT Sensor parameter is greater than 60°C (140°F) .

The EVAP Purge Solenoid Command parameter is greater than 1 percent .

The Fuel Alcohol content parameter is less than 90 percent .

The MAF Sensor parameter is between 20-55 g/s .

The Engine Speed parameter is between 1,200-3,000 RPM .

The TP Indicated Angle parameter is 5 percent more than the value observed at idle.

The Loop Status parameter is closed.

The Ignition 1 Signal parameter is between 10-18 volts .

The Fuel Tank Level Remaining parameter is greater than 10 percent .

The Engine Run Time parameter is more than 160 seconds .

The above conditions are met for 1 second .

This diagnostic runs one time per drive cycle once the above conditions are met.


The PCM detects that the affected HO2S lean-to-rich or rich-to-lean transitions are less than a calibrated value for 100 seconds .





The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.

The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.





The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

Clear the MIL and the DTC with a scan tool.





Sounds like it is time for a new driver's side front 02 sensor.

Edited by Fireman31 (see edit history)
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