DTC P0133, P0134, P0140, or P1133. Saturn ION 2006

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2006 🢒 ION 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 DTC P0133, P0134, P0140, or P1133

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

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
HO2S High Signal	P0131, P0132, P0137, P0140, P1133, P2A00, P2A01	P0131, P0132, P0133, P0134, P0137, P0140, P1133, P2A00, P2A01	P0131, P0132, P0133, P0134, P0137, P0140, P1133, P2A00, P2A01	P0132, P0134, P0138, P0140, P1133, P2A00, P2A01	P0133, P0134, P0140, P1133, P2A00
HO2S Low Signal	P2A00, P2A01	P0131, P0132, P0133, P0134, P0138, P0140, P1133, P2A00, P2A01	P0131, P0132, P0133, P0134, P0138, P0140, P1133, P2A00, P2A01	P0134, P0138, P0140, P1133, P2A00, P2A01	P2A00

Typical Scan Tool Data

HO2S Sensor 1 Voltage

Circuit	Normal Range	Short to Ground	Open	Short to Voltage
HO2S High Signal	200-800 mV	0 mV	Approximately 470 mV	Approximately 1,100 mV
HO2S Low Signal	200-800 mV	455 mV	Approximately 450 mV	Approximately 445 mV

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.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

•	Engine Control Module Connector End Views

•	Engine Controls Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Verification

•	If any HO2S heater DTCs are set, perform those diagnostics first.

•	Allow the engine to reach operating temperature.

•	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 1,500 RPM for 30 seconds.

•	The affected HO2S may be damaged due to contamination. Prior to replacing the affected HO2S, inspect for the following sources of contamination:

Notice: Refer to Silicon Contamination of Heated Oxygen Sensors Notice in the Preface section.

-	A silicon contaminated HO2S

-	Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis .

-	Engine oil consumption--Refer to Oil Consumption Diagnosis .

-	Engine coolant consumption--Refer to Loss of Coolant .

Circuit/System Testing

Disconnect the affected HO2S.
Ignition ON, verify the applicable scan tool HO2S parameter is approximately 450 mV.

⇒	If more than the specified value, test the high signal circuit for a short to voltage. If the circuit tests normal, replace the control module.

⇒	If less than the specified value, test the high signal circuit for a short to ground. If the circuit tests normal, replace the control module.

Install a 3-amp fused jumper wire at the high signal circuit terminal. Toggle the jumper wire between the low signal circuit terminal and battery voltage. Verify the appropriate scan tool HO2S parameter toggles between 0 mV and approximately 1,000 mV.

⇒	If the appropriate scan tool HO2S parameter does not toggle correctly, test the low signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test the high signal circuit for an open/high resistance. If the circuits test normal, replace the control module.

If all circuits test normal, replace the appropriate HO2S.

Repair Instructions

Notice: Refer to Heated Oxygen Sensor Resistance Learn Reset Notice in the Preface section.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Heated Oxygen Sensor 1 Replacement

•	Heated Oxygen Sensor 2 Replacement

•	Control Module References for powertrain control module (PCM) replacement, setup, and programming