Code PO135 O2 Sensor
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Joined: Feb 2014
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From: Omaha NE
Code PO135 O2 Sensor
Check engine light came on right when I noticed the car running kind of cruddy.. 02 ZO6 with 95k miles. Not sure when the last time the sensors were replaced but the code is for the sensor 1 bank 1 O2 sensor (front driver side upstream). But it feels like there is more to it than just a bad sensor. It has been bogging way down at idle right after ignition but then it seems to get better after it warms up. Drives kind of cruddy at low RPMs and feels like a slight loss of power. However, it drives fine at higher RPMs. Anyone have any suggestions, thoughts, or opinions? Any help would be greatly appreciated!! Also, would anyone recommend against Bosch replacement sensors?? I know they are German but they're almost $80 cheaper and pretty popular.. Thanks!
Drifting
Joined: Sep 2009
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From: cinnaminson n.j.
St. Jude Donor '14
P0135
CIRCUIT DESCRIPTION
The powertrain control module (PCM) supplies a bias voltage of approximately 450 mV on the heated oxygen sensor (HO2S) high and low signal circuits. When you turn the ignition ON, the battery voltage is supplied to the HO2S heater. As the heater reaches the operating temperature, the HO2S voltage responds by changing from a bias voltage range to the normal operation. Typically, as the HO2S reaches the operating temperature, the HO2S voltage goes from a bias voltage to a voltage below 300 mV . Depending on the exhaust gas content, the HO2S voltage can go above 450 mV .
The PCM runs the heater test only on a cold start, depending on the cumulative air flow, and only once an ignition cycle. When you start the engine, the PCM monitors the HO2S voltage. If the HO2S voltage goes above or below the bias range threshold, the PCM determines how much time passed. If the PCM detects that the process took too much time for the HO2S to enter into normal operating range, a DTC sets.
CONDITIONS FOR RUNNING THE DTC
DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0131, P0132, P0134, P0137, P0138, P0140, P0151, P0152, P0154, P0157, P0158, P0160, P0200, P0300, P0410, P0440, P0442, P0446, P0452, P0453, P1120, P1125, P1220, P1221, P1221, P1258, P1415, P1416, P1441, P1514, P1515, P1516, P1517, or P1518 are not set.
The intake air temperature (IAT) and the engine coolant temperature (ECT) are less than 50°C (122°F ) and are within 8°C (14.5°F ) of each other at engine start-up.
The HO2S voltage is between 425-475 mV at engine start-up.
The ignition 1 signal is between 9-18 volts .
Intrusive tests are not in progress.
Scan tool output controls are not active.
The mass air flow (MAF) is less than 21 g/s .
CONDITIONS FOR SETTING THE DTC
The HO2S voltage remains within 150 mV of the start-up voltage for a predetermined amount of time based on the engine coolant temperature and the air flow.
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.
DIAGNOSTIC AIDS
IMPORTANT:
Before you service the PCM and throttle actuator control (TAC) module, remove any debris from the module connector surfaces. Inspect the module connector gaskets when you diagnose or replace the modules. Ensure that the gaskets are correctly installed. The gaskets prevent contaminate intrusion into the modules.
For any test that requires probing the PCM or probing a component harness connector, use the J 35616-A Connector Test Adapter Kit. Using this kit prevents damage to the harness and component terminals. Refer to Using Connector Test Adapters in Diagnostic Aids.
The heater diagnostic will only run on a cold start and will run once per ignition cycle.
An oxygen supply inside the HO2S is necessary for proper operation. The HO2S wires provide the supply of oxygen. Inspect the HO2S wires and connections for breaks or contamination. Refer to Wiring Repairs in Diagnostic Aids.
For an intermittent condition, refer to Intermittent Conditions. See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Initial Inspection and Diagnostic Overview\Diagnostic Strategies\Intermittent Conditions
The main function of the pre-catalyst heated oxygen sensor (HO2S ) is to provide the PCM with exhaust stream information in order to maintain proper fueling to hold emissions within acceptable levels. These oxygen sensors are always located between the exhaust manifold and the catalytic convener. After the sensor reaches the operating temperature, the sensor generates a voltage inversely proportional to the amount of oxygen present in the exhaust gases.
The PCM uses the signal voltage from the fuel control heated oxygen sensors in a closed loop in order to adjust the fuel injector pulse width. While in a closed loop, the PCM can adjust fuel delivery in order to maintain an air to fuel ratio which allows the best combination of emission control and driveability. If the oxygen sensor pigtail wiring, connector or terminal are damaged, replace the entire oxygen sensor assembly. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly, the sensor must have a clean air reference provided to it. This clean air reference is obtained by way of the oxygen sensor wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference. Any attempt to repair the wires, connectors or terminals could degrade oxygen sensor performance.
With the engine cold unplug bank one primary o2 sensor. Connect a test light between the black and brown wires. Start the engine. Test light should be lit. If not locate open circuit, check fuses for no b+. If the light is lit, replace the sensor.
CIRCUIT DESCRIPTION
The powertrain control module (PCM) supplies a bias voltage of approximately 450 mV on the heated oxygen sensor (HO2S) high and low signal circuits. When you turn the ignition ON, the battery voltage is supplied to the HO2S heater. As the heater reaches the operating temperature, the HO2S voltage responds by changing from a bias voltage range to the normal operation. Typically, as the HO2S reaches the operating temperature, the HO2S voltage goes from a bias voltage to a voltage below 300 mV . Depending on the exhaust gas content, the HO2S voltage can go above 450 mV .
The PCM runs the heater test only on a cold start, depending on the cumulative air flow, and only once an ignition cycle. When you start the engine, the PCM monitors the HO2S voltage. If the HO2S voltage goes above or below the bias range threshold, the PCM determines how much time passed. If the PCM detects that the process took too much time for the HO2S to enter into normal operating range, a DTC sets.
CONDITIONS FOR RUNNING THE DTC
DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0131, P0132, P0134, P0137, P0138, P0140, P0151, P0152, P0154, P0157, P0158, P0160, P0200, P0300, P0410, P0440, P0442, P0446, P0452, P0453, P1120, P1125, P1220, P1221, P1221, P1258, P1415, P1416, P1441, P1514, P1515, P1516, P1517, or P1518 are not set.
The intake air temperature (IAT) and the engine coolant temperature (ECT) are less than 50°C (122°F ) and are within 8°C (14.5°F ) of each other at engine start-up.
The HO2S voltage is between 425-475 mV at engine start-up.
The ignition 1 signal is between 9-18 volts .
Intrusive tests are not in progress.
Scan tool output controls are not active.
The mass air flow (MAF) is less than 21 g/s .
CONDITIONS FOR SETTING THE DTC
The HO2S voltage remains within 150 mV of the start-up voltage for a predetermined amount of time based on the engine coolant temperature and the air flow.
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.
DIAGNOSTIC AIDS
IMPORTANT:
Before you service the PCM and throttle actuator control (TAC) module, remove any debris from the module connector surfaces. Inspect the module connector gaskets when you diagnose or replace the modules. Ensure that the gaskets are correctly installed. The gaskets prevent contaminate intrusion into the modules.
For any test that requires probing the PCM or probing a component harness connector, use the J 35616-A Connector Test Adapter Kit. Using this kit prevents damage to the harness and component terminals. Refer to Using Connector Test Adapters in Diagnostic Aids.
The heater diagnostic will only run on a cold start and will run once per ignition cycle.
An oxygen supply inside the HO2S is necessary for proper operation. The HO2S wires provide the supply of oxygen. Inspect the HO2S wires and connections for breaks or contamination. Refer to Wiring Repairs in Diagnostic Aids.
For an intermittent condition, refer to Intermittent Conditions. See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Initial Inspection and Diagnostic Overview\Diagnostic Strategies\Intermittent Conditions
The main function of the pre-catalyst heated oxygen sensor (HO2S ) is to provide the PCM with exhaust stream information in order to maintain proper fueling to hold emissions within acceptable levels. These oxygen sensors are always located between the exhaust manifold and the catalytic convener. After the sensor reaches the operating temperature, the sensor generates a voltage inversely proportional to the amount of oxygen present in the exhaust gases.
The PCM uses the signal voltage from the fuel control heated oxygen sensors in a closed loop in order to adjust the fuel injector pulse width. While in a closed loop, the PCM can adjust fuel delivery in order to maintain an air to fuel ratio which allows the best combination of emission control and driveability. If the oxygen sensor pigtail wiring, connector or terminal are damaged, replace the entire oxygen sensor assembly. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly, the sensor must have a clean air reference provided to it. This clean air reference is obtained by way of the oxygen sensor wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference. Any attempt to repair the wires, connectors or terminals could degrade oxygen sensor performance.
With the engine cold unplug bank one primary o2 sensor. Connect a test light between the black and brown wires. Start the engine. Test light should be lit. If not locate open circuit, check fuses for no b+. If the light is lit, replace the sensor.
