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P0132



DTC P0132

DTC DESCRIPTORS

DTC P0131
HO2S Circuit Low Voltage Bank 1 Sensor 1

DTC P0132
HO2S Circuit High Voltage Bank 1 Sensor 1

DTC P0137
HO2S Circuit Low Voltage Bank 1 Sensor 2

DTC P0138
HO2S Circuit High Voltage Bank 1 Sensor 2

DTC P0151
HO2S Circuit Low Voltage Bank 2 Sensor 1

DTC P0152
HO2S Circuit High Voltage Bank 2 Sensor 1

DTC P2A00
HO2S Performance Bank 1 Sensor 1

DTC P2A01
HO2S Performance Bank 1 Sensor 2

DTC P2A03
HO2S Performance Bank 2 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.

P2A01
The HO2S 2 is used for catalyst monitoring. This diagnostic runs once per ignition cycle. This diagnostic consists of two tests, a passive test and an intrusive test. During the passive test, if the HO2S 2 voltage transitions below 300 mV and above 650 mV, the DTC will pass for this ignition cycle. If the DTC does not pass during the passive test, the intrusive test will begin. During the intrusive test, the control module will force the air-to-fuel ratio rich and/or lean. The control module then waits for a predicted response from the HO2S 2. If the HO2S 2 voltage transitions below 300 mV and/or above 650 mV, the DTC will pass for this ignition cycle.

CONDITIONS FOR RUNNING THE DTC

DTC P0131
- 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 Loop Status parameter is Closed.
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Fuel Tank Level Remaining parameter is more than 10 percent.
- The Throttle Position (TP) Indicated Angle parameter is between 0-50 percent.
- The equivalence ratio is between 0.99-1.01.
- DTC P0131 runs the lean test continuously when the above conditions are met for 3 seconds.

DTC P0132
- 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 Loop Status parameter is Closed.
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Fuel Tank Level Remaining parameter is more than 10 percent.
- The Throttle Position (TP) Sensor parameter is between 0-60 percent.
- The equivalence ratio is between 0.99-1.01.
- DTC P0132 runs the rich test continuously when the above conditions are met for 3 seconds.

DTC P0137
- 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 Loop Status parameter is Closed.
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Fuel Tank Level Remaining parameter is more than 10 percent.
- The Power Enrichment parameter is active for more than 3 seconds.
- The equivalence ratio is between 0.99-1.01.
- DTC P0137 runs the power enrichment test during each occurrence of power enrichment, when the above conditions are met for 3 seconds.

DTC P0138
- 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 Loop Status parameter is Closed.
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Fuel Tank Level Remaining parameter is more than 10 percent.
- The TP Sensor parameter is between 0-50 percent.
- The equivalence ratio is between 0.99-1.01.
- DTC P0138 runs the rich test continuously when the above conditions are met for 3 seconds.

DTC P0151
- 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 Loop Status parameter is Closed.
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Fuel Tank Level Remaining parameter is more than 10 percent.
- The Throttle Position (TP) Sensor parameter is between 0-50 percent.
- The Equivalence ratio is between 0.99-1.01.
- DTC P0151 runs the test continuously when the above conditions are met for 3 seconds.

DTC P0152
- 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 Loop Status parameter is Closed.
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Fuel Tank Level Remaining parameter is more than 10 percent.
- The Throttle Position (TP) Sensor parameter is between 0-60 percent.
- The Equivalence ratio is between 0.99-1.01.
- DTC P0152 runs the test continuously when the above conditions are met for 3 seconds.

DTC P2A00
- 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 Run Time parameter is more than 100 seconds.
- The Engine speed parameter is between 500-5,000 RPM.
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Mass Airflow (MAF) Sensor parameter is between 3-30 g/s.
- The ECT Sensor parameter is more than 70°C (158°F).
- DTC P2A00 runs continuously when the above conditions are met for 5 seconds.

DTC P2A01 Passive Test
- DTCs P0030, P0036, P0053, P0054, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1516, P2101, P2119, P2135, P2176, P2A00 are not set.
- The engine is running.
- The Engine Run Time parameter is less than 260 seconds.
- DTC P2A01 runs the passive test once per drive cycle when the above conditions are met for 2 seconds.

DTC P2A01 Intrusive Test
- DTCs P0030, P0036, P0053, P0054, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1516, P2101, P2119, P2135, P2176, P2A00 are not set.
- The Engine Run Time parameter is more than 260 seconds.
- The ignition 1 Signal parameter is between 10-18 volts.
- The MAF sensor parameter is between 0.5-50 g/s.
- The Engine Speed parameter is between 500-5,000 RPM.
- The Vehicle Speed parameter is between 24-145 km/h (20-80 mph).
- The Short Term FT parameter is between 5 and -5 percent.
- DTC P2A01 runs the intrusive test once per drive cycle when the above conditions are met for 1 second.

DTC P2A03
- DTCs P0030, P0036, P0053, P0054, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1516, P2101, P2119, P2135, P2176, P2A00 are not set.
- The Engine Run Time parameter is more than 100 seconds.
- The ignition 1 Signal parameter is between 10-18 volts.
- The MAF sensor parameter is between 3-30 g/s.
- The Engine Speed parameter is between 500-5,000 RPM.
- DTC P2A01 runs continuously when the above conditions are met for 5 seconds.

CONDITIONS FOR SETTING THE DTC

DTC P0131
- The control module detects that the HO2S 1 Voltage parameter is less than 25 mV.
- DTC P0131 sets within 100 seconds during the lean test when the above condition is met.

DTC P0132
- The control module detects that the HO2S 1 parameter is more than 950 mV.
- DTC P0132 sets within 15 seconds during the rich test when the above condition is met.

DTC P0137 Lean Test
- The control module detects that the HO2S 2 voltage parameter is less than 75 mV.
- DTC P0137 sets within 100 seconds during the lean test when the above condition is met.

DTC P0138 Rich Test
- The control module detects that the HO2S 2 voltage parameter is more than 950 mV.
- DTC P0138 sets within 100 seconds during the rich test when the above condition is met.

DTC P0151
- The control module detects that the HO2S Bank 2 Sensor 1 Voltage parameter is less than 100 mV.
- DTC P0151 sets within 3 seconds when the above condition is met.

DTC P0152
- The control module detects that the HO2S Bank 2 Sensor 1 Voltage parameter is more than 950 mV.
- DTC P0151 sets within 3 seconds when the above condition is met.

DTC P2A00
- The control module detects that the Loop Status parameter is open.
- DTC P2A00 sets within 5 seconds when the above condition is met.

DTC P2A01
- The control module detects that the HO2S 2 did not transition below 299 mV and above 751 mV during the passive test.
- One of the following tests fail once per trip/runs until pass or fail reporting:
- Lean Intrusive Test-The control module detects that the HO2S 2 is more than 751 mV for 8 seconds.
- Rich Intrusive Test-The control module detects that the HO2S 2 is less than 299 mV for 8 seconds.
- DTC P2A01 sets within 2 minutes when the above conditions are met.
- The control module detects that the Loop Status parameter is open by not meeting the voltage criteria to enable close loop fueling.Voltage cannot be between 250-600 mV for 10 seconds after the O2 has seen a ready to go closed loop command.
- DTC P2A00 sets within 5 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 bank 1 sensor 1 value should vary from below 200 mV to above 800 mV and respond to fueling changes.
- The HO2S 1 bank 2 sensor 1 value should vary from below 200 mV to above 800 mV and respond to fueling changes.
- The HO2S 2 bank 1 sensor 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.
- 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
- 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

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

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 (HO2S) Replacement Bank 1 Sensor 1
- Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2
- Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1
- Control Module References for replacement, setup, and programming Verification Tests
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