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P0132



DTC P0132

DTC DESCRIPTORS

DTC P0131
HO2S Circuit Low Voltage Sensor 1

DTC P0132
HO2S Circuit High Voltage Sensor 1

DTC P0137
HO2S Circuit Low Voltage Sensor 2

DTC P0138
HO2S Circuit High Voltage Sensor 2

DTC P2A00
HO2S Circuit Closed Loop (CL) Performance Sensor 1

DTC P2A01
HO2S Circuit Sensor 2

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

P0131 Lean Test Enable
- 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 Level Sensor parameter is more than 10 percent.
- The Throttle Position (TP) Indicated Angle parameter is between 15-50 percent.
- DTC P0131 runs the lean test continuously when the above conditions are met for 2 seconds.

P0131 Power Enrichment Test Enable
- 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 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 30 seconds.
- DTC P0131 runs the power enrichment test continuously when the above conditions are met for 2 seconds.

P0132 Rich Test Enable
- 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 Level Sensor parameter is more than 10 percent.
- The Throttle Position (TP) Sensor parameter is between 0-50 percent.
- DTC P0132 runs the rich test continuously when the above conditions are met for 2 seconds.

P0132 Decel Fuel Cut-Off Test Enable
- 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 Level Sensor parameter is more than 10 percent.
- The Engine Run Time parameter is more than 30 seconds.
- DTC P0132 runs the decel fuel cut-off test continuously when the above conditions are met for 2 seconds.

P0137 Lean Test Enable
- 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 Level Sensor parameter is more than 10 percent.
- The TP Sensor parameter is between 15-50 percent.
- DTC P0137 runs the lean test continuously when the above conditions are met for 2 seconds.

P0137 Power Enrichment Test Enable
- 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 Level Sensor parameter is more than 10 percent.
- The Engine Run Time parameter is more than 30 seconds.
- The Power Enrichment parameter is active for more than 2 seconds.
- DTC P0137 runs the power enrichment test during each occurrence of power enrichment, when the above conditions are met for 3 seconds.

P0138 Rich Test Enable
- 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 Level Sensor parameter is more than 10 percent.
- The TP Sensor parameter is between 0-50 percent.
- DTC P0138 runs the rich test continuously when the above conditions are met for 2 seconds.

P0138 Decel Fuel Cut-Off Test Enable
- 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 Level Sensor parameter is more than 10 percent.
- The Engine Run Time parameter is more than 30 seconds.
- The decel fuel cut-off (DFCO) is active.
- DTC P0138 runs the decel. fuel cut-off test during each occurrence of the decel. fuel cut-off, when the above conditions are met for 2 seconds.

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 1,000-3,400 RPM.
- The Ignition 1 Signal parameter is between 10-18 volts.
- The Mass Airflow (MAF) Sensor parameter is between 10-30 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.

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 13.3 minutes.
- DTC P2A01 runs the passive test once per drive cycle when the above conditions are met.

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 13.3 minutes.
- The ignition 1 Signal parameter is between 10-18 volts.
- The MAF sensor parameter is between 14-100 g/s.
- The Engine Speed parameter is between 1,000-5,000 RPM.
- The Vehicle Speed parameter is between 32-129 km/h (20-80 mph).
- The Short Term FT parameter is between -20 and +20 percent.
- The maximum number of intrusive attempts is less than 50.
- DTC P2A01 runs the intrusive test once per drive cycle when the above conditions are met for 1 second.

CONDITIONS FOR SETTING THE DTC

P0131 Lean Test
- The control module detects that the HO2S 1 Voltage parameter is less than 50 mV.
- DTC P0131 sets within 100 seconds during the lean test when the above condition is met.

P0131 Power Enrichment Test
- The control module detects that the HO2S 1 Voltage parameter is less than 800 mV.
- DTC P0131 sets within 100 seconds during the power enrichment test when the above condition is met.

P0132 Rich Test
- The control module detects that the HO2S 1 parameter is more than 1,000 mV.
- DTC P0132 sets within 15 seconds during the rich test when the above condition is met.

P0132 Decel Fuel Cut-Off Test
- The control module detects that the HO2S 1 parameter is more than 900 mV.
- DTC P0132 sets within 10 seconds during the decel fuel cut-off test when the above condition is met.

P0137 Lean Test
- The control module detects that the HO2S 2 voltage parameter is less than 50 mV.
- DTC P0137 sets within 100 seconds during the lean test when the above condition is met.

P0137 Power Enrichment Test
- The control module detects that the HO2S 2 voltage parameter is less than 550 mV and the HO2S 1 parameter is more than 800 mV.
- DTC P0137 sets within 100 seconds during the power enrichment test when the above condition is met.

P0138 Rich Test
- The control module detects that the HO2S 2 voltage parameter is more than 1,000 mV.
- DTC P0138 sets within 100 seconds during the rich test when the above condition is met.

P0138 Decel Fuel Cut-Off Test
- The control module detects that the HO2S 2 voltage parameter is more than 900 mV.
- DTC P0138 sets within 100 seconds during the decel fuel cut-off test when the above condition is met.

P2A00
- The control module detects that the Loop Status parameter is open.
- DTC P2A00 sets within 50 seconds when the above condition is met.

P2A01
1. The control module detects that the HO2S 2 did not transition below 300 mV and above 700 mV during the passive test.
2. One of the following tests fail:

Lean Intrusive Test
- The control module detects that the HO2S 2 is more than 300 mV for 12 seconds.
- The HO2S 1 is less than 350 mV.

Rich Intrusive Test
- The control module detects that the HO2S 2 is less than 700 mV for 12 seconds.
- The HO2S 1 is more than 600 mV.

3. DTC P2A01 sets within 7 minutes when the above conditions are 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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