Check engine light came on so ns took my truck to AutoZone. Their diagnostic an equipment said it to be a downstream number two o2 sensor. Is over there a diagram that can present me where exactly it is and what bank it might be? many thanks in advance!

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Hi and thanks for utilizing are the directions for removal and also replacement. The attached snapshot shows location. Based upon what friend indicated, friend are trying to find 2/2 in the picture.Here is a connect that mirrors in basic how to replace one: me know if this help or if you have other questions.Take care,Joe

thank you really much guys. I additionally forgot to mention that I replaced 2/2 before and also it didn't deal with the inspect engine light. In that case would you recommend an altering 1/2 as well as 2/2 simply to do sure?

Welcome back:Honestly, before I arbitrarily answer that, could you provide the trouble code that to be found? I would certainly hate to say change the other one and also waste your money. (since the new sensor to be installed, has actually the computer system been cleared)? If so, go the light come earlier on through the very same code?If possible, allow me understand the code. The sensor may not it is in the problem but rather a resistance issue in the wiring or other difficulty which is bring about the sensor to fail.Let me know.Joe

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Welcome back: inspect out the diagrams (Below).That code is pertained to the sensor friend replaced. I feel confident instead of the other sensor will not aid and will certainly be a rubbish of money. Below is the problem. The circuit is open. Usually there is one of two people a damaged wire going come the sensor, one of the pins at the PCM or sensor or PCM is corroded and also not enabling power to flow or the PCM itself has actually failed. Most likely it corrosion or a broken wire. Also, if you had connections apart, make certain none that the pins in the plug were propelled in and also not make contact.I hate to perform this, but I am going to carry out a diagnostic circulation chart associated specifically to this code. If you have the right to work gradually through it, friend will uncover the problem. Also, before beginning the procedure, confirm that wiring to the sensor isn't damaged, broken, or disconnected at any kind of point. Additionally, pay attention when checking the wiring all over it might touch one engine or exhaust component. I have often times viewed wiring that division internally under the insulator and although girlfriend can't check out the break, you have the right to feel it v your hands. Girlfriend can also check the wire for continuity. Below are the directions. Note that the pictures correlate v these directions. I will provide links in ~ the end that will aid with testing.P0161-O2 SENSOR 2/2 HEATER PERFORMANCEFor complete wiring diagrams describe Diagrams/Electrical. - as soon as Monitored:Continuously throughout O2 sensor heater operation with battery voltage in between 10.4 and 15.75 volts and also no O2 sensor circuit DTCs present. - set Condition:The PCM detects no temperature adjust in the O2 sensor heater element when the heater circuit is active. The heater temperature is obtained by measure up the heater resistance and calculating the heater temperature. Two trip fault. Three good trips to rotate off the MIL.Always perform the Pre-Diagnostic Troubleshooting procedure prior to proceeding. TESTING.Diagnostic Test1. O2 SENSOR HEATER OPERATIONTurn the ignition off.NOTE: Wait a minimum of 8 minute to enable the O2 Sensor to cool down prior to continuing the test. Allow the O2 Sensor voltage to stabilize between 4.6 and also 5.0 volts.Ignition on, engine not running.With a scan tool, actuate the O2 Heater Test.With a scan tool, monitor 2/2 O2 Sensor voltage for at the very least 2 minutes.Does the voltage stay over 4.5 volts?Yes - walk To 2No - refer to the INTERMITTENT condition Diagnostic Procedure. See: Computers and also Control equipment > ingredient Tests and General Diagnostics > Intermittent Condition2. O2 SENSOR HEATER ELEMENTTurn the ignition off.NOTE: allow the O2 sensor come cool down to room temperature.Disconnect the O2 Sensor harness connector.Measure the resistance of the 2/2 O2 Heater Element, in between the O2 Heater manage terminal and the O2 Heater floor terminal in the O2 Sensor connector.NOTE: O2 Heater element resistance values need to be measured in ~ 21.1 C (70 F). The resistance worth will vary with different temperature values.Is the resistance the the O2 Sensor Heater facet between 2.0 and also 30.0 ohms?Yes - walk To 3No - replace the O2 Sensor. - execute POWERTRAIN verification TEST. See: A l L Diagnostic problem Codes ( DTC ) > verification Tests > Powertrain verification Test3. (K399) O2 2/2 HEATER manage CIRCUIT OPENDisconnect the C3 PCM harness connector.CAUTION: carry out not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in bad terminal to pen connection. Install Miller Special device #8815 to carry out diagnosis.Measure the resistance the the (K399) O2 2/2 Heater control circuit native the O2 exploit connector to the proper terminal of special device #8815.Is the resistance below 0.5 of one ohm?Yes - go To 4No - repair the excessive resistance in the (K399) O2 2/2 Heater manage circuit. - execute POWERTRAIN confirmation TEST. See: A together L Diagnostic problem Codes ( DTC ) > confirmation Tests > Powertrain verification Test4. (Z992) O2 2/2 HEATER ground CIRCUIT OPENUsing a 12 volt check light linked to 12 volts, inspect the (Z992) ground circuit in the 2/2 Oxygen Sensor harness connector.NOTE: The check light need to be illuminated and also bright. To compare the brightness to the of a direct connection to the battery.Is the test light illuminated and also bright?YesNo - fix the excessive resistance in the (Z992) O2 2/2 Heater floor circuit. - do POWERTRAIN verification TEST. See: A l L Diagnostic trouble Codes ( DTC ) > confirmation Tests > Powertrain confirmation Test5. PCMNOTE: before continuing, inspect the PCM exploit connector terminals for corrosion, damage, or terminal push out. Repair together necessary.Using the schematics as a guide, check the wire harness and connectors. Pay details attention to every Power and Ground circuits.Were there any problems found?Yes - Repair as necessary. - carry out POWERTRAIN confirmation TEST. See: A l L Diagnostic problem Codes ( DTC ) > verification Tests > Powertrain verification TestNo - Replace and program the Powertrain control Module. - do POWERTRAIN confirmation TEST. See: A l L Diagnostic problem Codes ( DTC ) > confirmation Tests > Powertrain verification TestPicture 5 reflects the PCM and also its location. The Powertrain control Module (PCM) is located in the right-rear section of the engine compartment under the cowl. Now, two various PCM's are provided (JTEC and NGC). These have the right to be quickly identified. JTEC's use three 32-way connectors, NGC's use 4 38-way connectors.Now, the exam I included require the usage of a volt meter or multi meter and a test light. Below are web links that display how they space used. Also, I contained a connect that shows how to inspect wiring.'t it is in intimidated through the directions. Simply take your time and also do one point at a time. Also, if friend still can't acquire the engine light to reset, carry out this. Disconnect the battery (both an unfavorable and optimistic terminals). Utilizing a zip tie, strap the terminal end together and let them like that for about fifteen minutes. This will drain power indigenous the capacitors and also should reset the system.Let me recognize if ns can help or if you have actually other questions. Honestly, my an initial suspect is a corrosion problem at among the plugs or a damaged wire. The code shows an open circuit, so basically, power have the right to not flow. It's connect a irradiate switch in the off position.Check out the diagrams (Below). Please let us know what friend find.