67speeda Posted December 13, 2008 Report Posted December 13, 2008 Po140- Bank 1 sensor 2 assume thats the after cat 02 on driver or pass side? need to order and didnt check it out on all data when i was at work..... get a GM replacement (get for cost) or an aftermarket? Quote
Fireman31 Posted December 13, 2008 Report Posted December 13, 2008 According to AllData...... DTC P0140 CIRCUIT 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 powertrain control module (PCM) supplies the HO2S with a reference, or bias, voltage of about 450 mV . When the engine is first started, the PCM 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. This diagnostic will only run once per ignition cycle. If the PCM detects that the HO2S voltage remains within the bias voltage range, DTC P0140 sets for HO2S bank 1 sensor 2, or DTC P0160 sets for HO2S bank 2 sensor 2. DTC DESCRIPTORS This diagnostic procedure supports the following DTCs: DTC P0140 HO2S Circuit Insufficient Activity Bank 1 Sensor 2 DTC P0160 HO2S Circuit Insufficient Activity Bank 2 Sensor 2 CONDITIONS FOR RUNNING THE DTC DTCs P0054, P0060, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0128, P0141, P0161, P0169, P0178, P0179, P0200, P0220, P0442, P0446, P0452, P0453, P0455, P0496, P1125, P1258, P1516, P2101, P2108, P2135, U0107 are not set. The Fuel Alcohol content parameter is less than 90 percent . The Engine Run Time parameter is more than 300 seconds . The Loop Status is closed. The Ignition 1 Signal parameter is between 10-18 volts . This diagnostic runs one time per drive cycle once the above conditions are met. CONDITIONS FOR SETTING THE DTC The PCM detects that the affected HO2S voltage parameter is between 410-490 mV for 150 seconds . The TP Indicated Angle parameter changes more than 5 percent within 1 second , 6 times. 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. I would clear the code and see if it returns, if it does, replace the driver's side rear 02 sensor........ Quote
RockHead Posted December 13, 2008 Report Posted December 13, 2008 P0140 DTC P0140 CIRCUIT 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 powertrain control module (PCM) supplies the HO2S with a reference, or bias, voltage of about 450 mV . When the engine is first started, the PCM 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. This diagnostic will only run once per ignition cycle. If the PCM detects that the HO2S voltage remains within the bias voltage range, DTC P0140 sets for HO2S bank 1 sensor 2, or DTC P0160 sets for HO2S bank 2 sensor 2. DTC DESCRIPTORS This diagnostic procedure supports the following DTCs: DTC P0140 HO2S Circuit Insufficient Activity Bank 1 Sensor 2 DTC P0160 HO2S Circuit Insufficient Activity Bank 2 Sensor 2 CONDITIONS FOR RUNNING THE DTC DTCs P0054, P0060, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0128, P0141, P0161, P0169, P0178, P0179, P0200, P0220, P0442, P0446, P0452, P0453, P0455, P0496, P1125, P1258, P1516, P2101, P2108, P2135, U0107 are not set. The Fuel Alcohol content parameter is less than 90 percent . The Engine Run Time parameter is more than 300 seconds . The Loop Status is closed. The Ignition 1 Signal parameter is between 10-18 volts . This diagnostic runs one time per drive cycle once the above conditions are met. CONDITIONS FOR SETTING THE DTC The PCM detects that the affected HO2S voltage parameter is between 410-490 mV for 150 seconds . The TP Indicated Angle parameter changes more than 5 percent within 1 second , 6 times. 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. Quote
RockHead Posted December 13, 2008 Report Posted December 13, 2008 According to AllData...... DTC P0140 CIRCUIT 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 powertrain control module (PCM) supplies the HO2S with a reference, or bias, voltage of about 450 mV . When the engine is first started, the PCM 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. This diagnostic will only run once per ignition cycle. If the PCM detects that the HO2S voltage remains within the bias voltage range, DTC P0140 sets for HO2S bank 1 sensor 2, or DTC P0160 sets for HO2S bank 2 sensor 2. DTC DESCRIPTORS This diagnostic procedure supports the following DTCs: DTC P0140 HO2S Circuit Insufficient Activity Bank 1 Sensor 2 DTC P0160 HO2S Circuit Insufficient Activity Bank 2 Sensor 2 CONDITIONS FOR RUNNING THE DTC DTCs P0054, P0060, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0128, P0141, P0161, P0169, P0178, P0179, P0200, P0220, P0442, P0446, P0452, P0453, P0455, P0496, P1125, P1258, P1516, P2101, P2108, P2135, U0107 are not set. The Fuel Alcohol content parameter is less than 90 percent . The Engine Run Time parameter is more than 300 seconds . The Loop Status is closed. The Ignition 1 Signal parameter is between 10-18 volts . This diagnostic runs one time per drive cycle once the above conditions are met. CONDITIONS FOR SETTING THE DTC The PCM detects that the affected HO2S voltage parameter is between 410-490 mV for 150 seconds . The TP Indicated Angle parameter changes more than 5 percent within 1 second , 6 times. 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. I would clear the code and see if it returns, if it does, replace the driver's side rear 02 sensor........ lmao we were the same thing Quote
67speeda Posted December 13, 2008 Author Report Posted December 13, 2008 i cleared it with my modus and it turned back on. The 02 is not switching like it should. Constant .4XX volts Quote
Tony-CA Posted December 14, 2008 Report Posted December 14, 2008 (edited) Catalyst efficency is determind by pre and post O2 switch ratios. The post cat O2 shouldnt switch much if the cat is hot and working. Since you have a Snap on Modis you should graph all 4 O2 pids and watch the values. What is B2S2 doing? What is B1S1 doing when B1S2 is at 400mv? The 400mv youre seeing could be a pcm bias voltage from a internal open in the O2 itself or a open wire to the pcm. If testing determines the O2 is bad Id go with a OEM replacement. Edited December 14, 2008 by SS TRCK (see edit history) Quote
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