P0132

Diagnostic Chart:

Wiring Diagram:

Circuit Description
The VCM supplies a voltage of about 0.45 volt (450 mV) between the HO2S High and HO2S Low circuits. (If measured with a megohm digital voltmeter, this may read as low as 0.32 volt.) The Heated Oxygen Sensor (HO2S Bank1 Sensor1) varies the voltage within the range of about 1.0 volt (1000 mV) if the exhaust is rich, down to about 0.10 volt (100 mV) if the exhaust is lean. The DTC P0132 is a type A DTC.

The Sensor is like an open circuit and produces no voltage when it is below 360°C (600°F). The DTC P0131, P0132 or an open sensor circuit or the cold sensor causes the Open Loop operation. The DTC P0132 determines if the HO2S sensor or the circuit is shorted to high by checking for a rich condition during a steady throttle.

Conditions for Setting the DTC
The following conditions will set the DTC:

^ No Throttle Position (TP) sensor DTCs.
^ No Evaporative Emissions (EVAP) DTCs.
^ No IAT sensor DTCs.
^ No MAP sensor DTCs.
^ No ECT sensor DTCs.
^ No MAF sensor DTCs.
^ No intrusive test in progress.
^ No device controls active.
^ The system voltage measures at least 9.0 volts.

Test Enable Rich Test

^ Closed Loop.
^ Air/fuel ratio is at least 14.5 but less than 14.8 TP is greater than 0% but less than 50%.
^ Above met for 5 seconds.
^ HO2S (Bank 2 Sensor 2) DTCs not active since code clear.
^ HO2S (Bank 2 Sensor 2) voltage is greater than (993 mV) 0.993V.

Test Enable Decel Fuel Cut Off (DFCO) Rich Test

^ Decel Fuel cutoff mode active.
^ Closed Loop.
^ Time elapsed is at least 2 seconds.
^ HO2S (Bank 2 Sensor 2) DTCs not active since code clear.
^ HO2S voltage is greater than (486 mV) 0.468V.

Action Taken When the DTC Sets
A current DTC P0132 causes the system to operate in the Open Loop. With a current DTC P0132 set, the Malfunction Indicator Lamp (MIL) illuminates after 1 test failure.

Conditions for Clearing the MIL/DTC
The VCM turns the MIL off after 3 consecutive driving trips without a fault condition present. A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 40°F from the start-up coolant temperature and the engine coolant temperature exceeds 160°F during that same ignition cycle) or the scan tool clearing feature has been used.

Diagnostic Aids
Check the following items:

^ The fuel pressure: If the pressure is too high, the system will run rich. The VCM can compensate for some increase; however, if the pressure gets too high, the DTC P0132 may set. Refer to Fuel System Diagnosis. System Diagnosis - Fuel System
^ A rich injector. Preform a poppet nozzle test. Refer to Fuel Injector Balance Test
^ A leaking injector. Refer to Fuel System Diagnosis. System Diagnosis - Fuel System
^ Fuel contaminated oil.

^ EVAP canister purge: Check for a fuel saturation. If full of fuel, check the canister control and hoses. Refer to Fuel System Cleaning. Service and Repair
^ Leaking fuel pressure regulator diaphragm by checking the vacuum line to the regulator for fuel.
^ The TP sensor: An intermittent TP sensor output causes the system to run rich due to a false indication of the throttle moving.
^ False rich indication due to silicon contamination of the heated oxygen sensor. A DTC P0132 accompanied by a lean driveability conditions and a powdery white deposit on the sensor indicates a false rich indication.
^ Faulty HO2S (Bank 1, Sensor 1): the HO2S (Bank 1, Sensor 1) is internally shorted, the HO2S (Bank 1, Sensor 1) voltage displayed on a scan tool will be over 1.0 volt (1000 mV). Try disconnecting the HO2S (Bank 1, Sensor 1), if the displayed voltage goes from over 1000 mV to around 450 mV, replace the HO2S (Bank 1, Sensor 1).

NOTE: Never solder the HO2S wires. For proper wire and connector repair, refer to Wiring Repairs.

Test Description
The number below refers to the step number on the diagnostic table.
2. This test determines if the conditions exist in order to set the DTC P0132.