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P0133



DTC P0133

DTC DESCRIPTORS

DTC P0133
HO2S Slow Response Sensor 1

DTC P0134
HO2S Circuit Insufficient Activity Sensor 1

DTC P0140
HO2S Circuit Insufficient Activity Sensor 2

DTC P1133
HO2S Insufficient Switching Sensor 1

DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection






TYPICAL SCAN TOOL DATA

HO2S Sensor 1 Voltage:






CIRCUIT/SYSTEM DESCRIPTION
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 control module supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started the control module 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.

CONDITIONS FOR RUNNING THE DTC

P0133
- DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
- The Engine Coolant Temperature (ECT) Sensor parameter is more than 70°C (158°F).
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Fuel Level Sensor parameter is more than 10 percent.
- The Engine Run Time parameter is more than 200 seconds.
- The Engine Speed parameter is between 1,000-3,500 RPM.
- The Manifold Absolute Pressure (MAP) Sensor parameter is more than 30 kPa.
- The Mass Airflow (MAF) Sensor parameter is between 11-50 g/s.
- The Loop Status parameter is Closed.
- The Throttle Position (TP) Indicated Angle parameter is more than 5 percent.
- DTC P0133 runs once per drive cycle when the above conditions are met for 2 seconds.

P0134
- DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
- The Engine Coolant Temperature (ECT) Sensor parameter is more than 70°C (158°F).
- The Ignition 1 Signal parameter is between 10-18 volts.
- The engine run time is more than 200 seconds.
- DTC P0134 runs continuously when the above conditions are met.

P0140
- DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
- The ECT Sensor parameter is more than 70°C (158°F).
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Engine Run Time parameter is more than 200 seconds.
- The Loop Status parameter is closed.
- DTC P0140 runs once per drive cycle when the above conditions are met.

P1133
- DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
- The ECT Sensor parameter is more than 70°C (158°F).
- The Engine Speed parameter is between 1,500-3,500 RPM.
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Engine Run Time parameter is more than 200 seconds.
- The Loop Status parameter is Closed.
- The TP Indicated Angle parameter is more than 5 percent.
- The Fuel Level Sensor parameter is more than 10 percent.
- The MAP Sensor parameter is more than 30 kPa.
- The MAF Sensor parameter is between 11-50 g/s.
- DTC P1133 runs once per drive cycle when the above conditions are met for 2 seconds.

CONDITIONS FOR SETTING THE DTC

P0133
- The control module detects that the HO2S 1 rich-to-lean or lean-to-rich average response time is more than 0.1 second.
- DTC P0133 sets within 60 seconds when the above condition is met.

P0134
- The control module detects that the HO2S 1 parameter is between 400-500 mV for 100 seconds.
- The Throttle Position (TP) Indicated Angle parameter changes more than 1 percent, 3 times.
- DTC P0134 sets within 100 seconds when the above conditions are met.

P0140
- The control module detects that the HO2S 2 parameter is between 425-475 mV.
- The TP Indicated Angle parameter changes more than 1 percent 3 times.
- DTC P0140 sets within 100 seconds when the above conditions are met.

P1133
- The control module detects that the HO2S 1 rich-to-lean counts, or the lean-to-rich counts are less than a calibrated value.
- DTC P1133 sets within 60 seconds when the above condition is met.

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.
- Clear the MIL and the DTC with a scan tool.

CIRCUIT/SYSTEM VERIFICATION
- Allow the engine to reach operating temperature. With the engine running, observe the affected HO2S parameter with a scan tool.
- The HO2S 1 value should vary from below 200 mV to above 800 mV and respond to fueling changes.
- The HO2S 2 value should change more than 200 mV when the throttle is quickly cycled 3 times from closed to wide open and back to closed after running the engine at 1500 RPM for 30 seconds.
- With the engine running at operating temperature, observe the affected HO2S sensor parameter with a scan tool and manipulate the related wiring and connectors. Manipulation should not affect the parameter.
- If manipulation does affect the parameter then repair the harness or connector.
- If any HO2S heater DTCs are set then diagnose those DTCs first.
- The affected HO2S may be damaged due to contamination. Prior to replacing the affected HO2S, inspect for the following sources of contamination:
- A silicon contaminated HO2S

NOTE: Refer to Silicon Contamination of Heated Oxygen Sensors Notice.

- Fuel contamination-Refer to Alcohol/Contaminants-in-Fuel Diagnosis. Alcohol/Contaminants-in-Fuel Diagnosis
- Engine oil consumption-Refer to Oil Consumption Diagnosis. Component Tests and General Diagnostics
- Engine coolant consumption-Refer to Loss of Coolant. Loss of Coolant

CIRCUIT/SYSTEM TESTING
1. With the ignition ON, the engine OFF, and the sensor disconnected, measure for approximately 45 mV from the affected HO2S sensor low signal circuit to ground.
- If more than approximately 45 mV, test the affected HO2S sensor low signal circuit for a short to voltage or a faulty control module.
- If less than approximately 45 mV, test the affected HO2S sensor low signal circuit for high resistance or for a faulty control module.
2. With the ignition ON, the engine OFF, and the sensor disconnected, measure for approximately 450 mV from the affected HO2S sensor high signal circuit to ground.
- If more than approximately 450 mV, test the affected HO2S sensor High Signal circuit for a short to voltage or a faulty control module.
- If less than approximately 450 mV, test the affected HO2S sensor high signal circuit for high resistance or for a faulty control module.
3. With the ignition ON, the engine OFF, and the sensor disconnected, install a 3-amp fused jumper between the affected HO2S sensor high signal circuit and the affected HO2S sensor low signal circuit. The affected HO2S parameter should indicate 0 mV.
- If all circuits and connectors test normal and the affected HO2S parameter does not indicate 0 mV, then replace the control module.
4. With the ignition ON, the engine OFF, and the sensor disconnected, install a test lamp between the affected HO2S sensor high signal circuit and battery voltage. The affected HO2S parameter should indicate approximately 1,095 mV.
- If all circuits and connectors test normal and the affected HO2S parameter does not indicate 1,095 mV then replace the control module.
5. If the control module and all circuits test normal, replace the affected HO2S sensor.

REPAIR INSTRUCTIONS

NOTE: Refer to Heated Oxygen Sensor (HO2S) Resistance Learn Reset Notice.

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Heated Oxygen Sensor Replacement - Position 1
- Heated Oxygen Sensor Replacement - Position 2
- Control Module References for replacement, setup, and programming. Verification Tests
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