Keep getting code p01133

Good morning,

This does not sound like an O2 issue, it sounds like a wiring issue that is intermittent. The heater portion of the sensor may be causing this code, not the sensor itself.

https://www.2carpros.com/articles/how-an-oxygen-sensor-works

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

I attached the description below with some diagrams for you.

https://www.2carpros.com/articles/how-to-check-wiring

Roy

CIRCUIT DESCRIPTION
This diagnostic applies only to vehicles built with Delphi heated oxygen sensors. To identify the heated oxygen sensor refer to Delphi/Denso Sensor in Computers and Control Systems Component Views.

The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 100 seconds. During this monitor period the PCM counts the number of times that the HO2S switches from rich to lean and lean to rich. A DTC P1133 or P1153 sets when the PCM determines that the HO2S did not switch enough times.

A lean to rich switch is determined when the HO2S voltage changes from less than 300 mV to more than 600 mV. A rich to lean switch is determined when the HO2S voltage changes from more than 600 mV to less than 300 mV.

CONDITIONS FOR RUNNING THE DTC
DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0200, P0300, P0401, P0404, P0405, P0410, P0440, P0442, P0446, P0452, P0453, P1120, P1125, P1220, P1221, P1258, P1404, P1415, P1416, P1514, P1515, P1516, P1517, or P1518 are not set.
The Engine Coolant Temperature (ECT) is more than 65°C (149°F).
The engine run time is more than 160 seconds.
The EVAP purge solenoid command is more than 0 percent.
The Mass Air Flow (MAF) is between 2-50 g/s.
The engine speed is between 1,200-3,000 RPM.
Vehicles without Throttle-actuated Control (TAC), the Throttle Position (TP) is more than 5 percent.
Vehicles with Throttle-actuated Control (TAC), the Throttle Position (TP) indicated angle is 5 percent more than the value observed at idle.
The loop status is closed.
The ignition 1 signal is between 9-18 volts.
The fuel tank level remaining is more than 10 percent.
Intrusive tests are not in progress.
The scan tool output controls are not active.

CONDITIONS FOR SETTING THE DTC
The HO2S lean-to-rich and rich-to-lean switches are less than a calibrated value for 100 seconds.

ACTION TAKEN WHEN THE DTC SETS
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.

CONDITIONS FOR CLEARING THE MIL/DTC
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.
Use a scan tool in order to clear the MIL and the DTC.

DIAGNOSTIC AIDS

IMPORTANT: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.

Inspect the HO2S high signal circuit for being shorted to a PCM ground. The HO2S high signal circuit shorted to a PCM ground sets a switching DTC.
A malfunction in the HO2S heater circuits will cause a DTC P1133 or P1153 to set. Check HO2S heater circuits for intermittent opens/connections.
An oxygen supply inside the HO2S is necessary for proper operation. This supply of oxygen is provided through the HO2S wires. All HO2S wires and connections should be inspected for breaks or contamination. Refer to Heated Oxygen Sensor (HO2S) Wiring Repairs in Diagrams.
Using the Freeze Frame/Failure Records data may help to locate an intermittent condition. If you cannot duplicate the DTC, use the Freeze Frame/Failure Records in order to determine how many miles since the DTC set. You can also use the Fail Counter and the Pass Counter in order to determine how many ignition cycles the diagnostic reported a pass and/or a fail. In order to isolate when the DTC failed, operate vehicle within the same freeze frame conditions that you observed:
- The RPM
- The vehicle load
- The vehicle speed
- The temperature

For an intermittent, Refer to Intermittent Conditions. See: Computers and Control Systems > Initial Inspection and Diagnostic Overview > Intermittent Conditions

If you had a bad injector, it would not read 0.

Did you verify the heater circuit is working?

Roy

Again, no.

When the heater circuit does not work, the sensor will default to this reading. It needs the heat generated by the heater for the sensor to work. This is whay I have suggested you test the heater circuit.

Roy

You need to follow the flow chart and also monitor the voltage at the sensor connector for the heater circuit. It could be the connection at the sensor itself.

I attached the connector diagram for you for testing.

Roy

Good find.

Glad it is fixed.

Roy