silverado_ss_04 Posted January 7, 2009 Report Share Posted January 7, 2009 P0141 O2 Sensor Heater Circuit (Bank 1 Sensor 2) P0161 O2 Sensor Heater Circuit (Bank 2 Sensor 2) was out driving my truck 2 days ago and everything was fine, next morning i have code p0141 and p0161. went to start my truck today and the same thing has happend. just wondering whats going on with the sensors, are they dead and i need new ones or what? Thanks. Quote Link to comment Share on other sites More sharing options...
dozer Posted January 8, 2009 Report Share Posted January 8, 2009 P0141 O2 Sensor Heater Circuit (Bank 1 Sensor 2)P0161 O2 Sensor Heater Circuit (Bank 2 Sensor 2) was out driving my truck 2 days ago and everything was fine, next morning i have code p0141 and p0161. went to start my truck today and the same thing has happend. just wondering whats going on with the sensors, are they dead and i need new ones or what? Thanks. Those are the post cat O2's. My guess there not getting hot enough. Do you have cats or high flow cats. Quote Link to comment Share on other sites More sharing options...
silverado_ss_04 Posted January 8, 2009 Author Report Share Posted January 8, 2009 i have the stock cats Quote Link to comment Share on other sites More sharing options...
mcwarren Posted January 8, 2009 Report Share Posted January 8, 2009 (edited) P0141 and P0161 indicate an electrical circuit problem with the heater circuit in the number 2 or rear O2 sensors. Check fuse O2B in the underhood electrical center as it powers both bank one and bank two rear or number 2 O2 heater circuits. If the fuse is blown check for excessive current draw or a short to ground in the wiring to the rear O2 sensors Edited January 8, 2009 by mcwarren (see edit history) Quote Link to comment Share on other sites More sharing options...
silverado_ss_04 Posted January 9, 2009 Author Report Share Posted January 9, 2009 thanks ill chek that out in a bit. Quote Link to comment Share on other sites More sharing options...
RockHead Posted January 9, 2009 Report Share Posted January 9, 2009 P0141 and P0161 DTC P0141 CIRCUIT DESCRIPTION The heated oxygen sensor (HO2S) must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensor to reach operating temperature. Voltage is provided to the heater by the ignition 1 voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit, through a low side driver within the powertrain control module (PCM). The PCM commands the heater ON or OFF to maintain a specific HO2S operating temperature range. The PCM determines the temperature by measuring the current flow through the heater. When the heater is in the ON state, the PCM will pulse the heater OFF for a duration of 50 ms , once per second. When the heater is in the OFF state, the PCM will pulse the heater ON for a duration of 50 ms , once per second. The PCM monitors the heater current with the engine running. This diagnostic will only run once per ignition cycle. If the PCM detects that the heater current is not within an expected range, DTC P0141 sets for HO2S bank 1 sensor 2, or DTC P0161 sets for HO2S bank 2 sensor 2. DTC DESCRIPTORS This diagnostic procedure supports the following DTCs: DTC P0141 HO2S Heater Performance Bank 1 Sensor 2 DTC P0161 HO2S Heater Performance 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, P0169, P0178, P0179, P0200, P0220, P0442, P0446, P0452, P0453, P0455, P0496, P1125, P1258, P1516, P2101, P2108, P2135, U0107 are not set. The ECT Sensor parameter is greater than 50°C (122°F) . The Ignition 1 Signal parameter is between 10-18 volts . The Fuel Alcohol content parameter is less than 90 percent . The MAF Sensor parameter is between 3-40 g/s . The Engine Speed parameter is between 500-3,000 RPM . The Engine Run Time parameter is more than 300 seconds . The above conditions are met for 2 seconds . This diagnostic runs one time per drive cycle when the above conditions are met. CONDITIONS FOR SETTING THE DTC The PCM detects that the affected HO2S Heater current parameter is greater than 1.375 amps or less than 0. 25 amps . The above condition is met for 10 seconds . 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 Link to comment Share on other sites More sharing options...
silverado_ss_04 Posted January 9, 2009 Author Report Share Posted January 9, 2009 i duno whats going on but they seem to be working fine now... Quote Link to comment Share on other sites More sharing options...
silverado_ss_04 Posted January 20, 2009 Author Report Share Posted January 20, 2009 the code is poping up again now, i cheked all the fuses and their all fine and i cheked everything under the truck. any other ideas? could i just get a tune for cat delete lol? Quote Link to comment Share on other sites More sharing options...
zippy Posted January 21, 2009 Report Share Posted January 21, 2009 That is rather odd, but if you want when I adjust your pcm next i can just tune them out. Quote Link to comment Share on other sites More sharing options...
silverado_ss_04 Posted January 21, 2009 Author Report Share Posted January 21, 2009 sounds good to me. that engine light is starting to piss me off lol Quote Link to comment Share on other sites More sharing options...
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