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  #1  
Old 07-07-2008, 10:16 AM
wtplv
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Default All four O2 sensors read bad

I have a 2000 Nissan Xterra V6 4x4 and it will not pass smog. I get P0135, P0141, P0155 and P0161 indicating that all four O2 sensors are bad and P0325 which indicates the knock sensor is bad. Is there a fuse for the O2 sensors and if so, which one is it? Also is there a fuse for the knock sensor?
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Old 07-08-2008, 08:55 AM
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P0135, P0141, P0155 and P0161 Al the codes are for the heater part of the O2 sensors and are power by the fuse #14. The knock the sensor does not have a fuse.
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All four O2 sensors read bad-figure1-gif   All four O2 sensors read bad-figure5-gif   All four O2 sensors read bad-figure3-gif   All four O2 sensors read bad-figure4-gif   All four O2 sensors read bad-figure6-gif  
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  #3  
Old 10-22-2009, 11:23 AM
Canuckgold
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I have exactly the same problem with the same codes. According to the service manager at my local Nissan dealership, it's highly unlikely that all 4 oxygen sensors would go bad at the same time so the problem is likely to be a bad ground connection. It could be a major fishing expedition to determine the exact cause so I came here looking for a solution to the problem and was hoping the original poster had posted the resolution. Does anyone know where the ground connection for the sensors is?

Thanks,
CG :)

Last edited by Canuckgold; 10-22-2009 at 11:30 AM.
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Old 10-22-2009, 07:38 PM
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Check all the fuses for open circuits. Also was there any work done to the engine wherer the O2 sensors had to disconnected. If so make sure they are reconnected properly.
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Old 12-27-2012, 07:42 AM
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Sorry, I don't mean to resurrect an old thread but found this link which will help troubleshoot these errors for others.
Single Fix for Multiple Nissan® O2 Sensor Codes

Single Fix for Multiple Nissan® O2 Sensor Codes

If one of the following vehicles comes into the shop with the “Malfunction Indicator Lamp” (MIL) “ON” and one or more of the following Diagnostic Trouble Codes (DTCs) are stored in Engine Control Module (ECM), the repair may be as simple as installing an additional ground sub-harness.
Applicable Vehicles
1996-1997 Nissan® Pathfinder®:
DTC P0130, P0150, P0136, or P0156
1998-2000 Nissan Pathfinder:
DTC P0131, P0134, P0138, P0140, P0151, P0154, P0158, P0160
1999-2001 Nissan Frontier® (V-6 Engine Only):
DTC P0131, P0134, P0138, P0140, P0151, P0154, P0158, P0160
2000-2001 Nissan Xterra® (V-6 Engine Only):
DTC P0131, P0134, P0138, P0140, P0151, P0154, P0158, P0160
2002-2004 Nissan Frontier (V-6 Engine Only):
DTC P1143, P0134, P0138, P1163, P0154, P1146, P1166, P0158
2002-2004 Nissan Xterra (V-6 Engine Only):
DTC P1143, P0134, P0138, P1163, P0154, P1146, P1166, P0158

If you retrieve these codes, use the following manufacturer’s Diagnosis and Service Procedure to confirm and repair the condition. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.
Desccription Part Number Quantity
Harness - Engine Sub
24075-0W060
1
Wiring - Clip
01552-00401KK
4
Bolt-Hex
08146-8121G
2
Diagnosis and Service Procedure
Review safety procedures in ALLDATA® RepairSM before beginning.
1. Check for poor grounding using a Digital Volt-Ohm Meter (DVOM).
2. Measure the voltage drop between the intake manifold ground bolt for the engine harness and the right hand (RH) cylinder head.
3. At engine warm idle, place the positive (red) meter lead on the intake manifold ground bolt for the engine ECCS harness and the negative (black) lead on RH cylinder head and measure the voltage.
• If the voltage is above 0.025V (25 millivolts), install the sub-harness shown in Figure 1 to resolve the incident. Continue with step two of this bulletin.
• If the voltage is less than 0.025V (25 millivolts), the problem will not be repaired with a sub-harness and will require further diagnosis. Refer to the System Diagnosis section in ALLDATA Repair.
4. Route the sub-harness from the RH cylinder head, on the existing ECCS harness. Route it toward the center front of the engine and then back toward the intake manifold collector (Figure 2).
5. Find the two threaded holes in the RH cylinder head next to the negative battery cable attachment point (Figure 3).
6. Secure the sub-harness end with the two larger eyelets to these two threaded holes (Figure 3).
7. Use the two new hex bolts to attach the sub-harness eyelets.
CAUTION: To prevent damage, the sub-harness must be positioned more than 70 mm (2.8 in.) from the exhaust manifold.
8. Now attach the sub-harness to the ECCS harness at four (4) places (Figure 4) using the wiring clips listed in the parts information. Space the wiring clips out as shown in Figure 4.
9. Secure the sub-harness end with the two smaller eyelets. You'll attach them using two of the existing ground bolts located on the intake manifold (Figure 3).
10. Trim the excess material from the newly installed wiring clips.

Written by ALLDATA Senior Automotive Technical Editor, Rich Diegle. Rich is an Advanced Engine Performance Certified, ASE Master Technician with an AA Degree in automotive technology and 23 years of dealership and independent shop experience.
©ALLDATA LLC. All rights reserved. All technical information, images and specifications are from ALLDATA Repair. ALLDATA is a registered trademark and ALLDATA Repair is a mark of ALLDATA LLC. All other brand names and marks are the property of their respective holders.
Nissan, Pathfinder, Xterra and Frontier are registered trademark names and model designations of the Nissan Motor Company. All trademark names and model designations are being used solely for reference and application purposes.
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  #6  
Old 12-28-2012, 10:23 PM
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THat was a Nissan TSB years ago. To add to that, the subharness from Nissan is ridiculously high priced. You can make the harness with some 10 gauge wire and eyelet connections. I usually cut the wire to length, install the eyelets, then use electrical tape to tape the pair of wires together for a more professional look. The bolts are 8MMx1.25.
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Old 12-29-2012, 02:16 AM
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Just A question are both your exhaust manifolds cracked and leaking. Make sure that the O2 sensor connectors are matched up properly.
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Old 10-04-2015, 10:26 AM
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Quote:
Originally Posted by smj999smj View Post
THat was a Nissan TSB years ago. To add to that, the subharness from Nissan is ridiculously high priced. You can make the harness with some 10 gauge wire and eyelet connections. I usually cut the wire to length, install the eyelets, then use electrical tape to tape the pair of wires together for a more professional look. The bolts are 8MMx1.25.
Is there a video anywhere where they show you steps by step how to do this fix... I have a 2004 nissan frontier wich I get all 4 o2 sensor codes. And it's running poorly no power and at times I give it gas and it doesn't go faster it gets stuck
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Old 04-05-2018, 03:34 PM
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I have a 2000 Xtera also and like many others it keeps saying o2 sensors and knock sensor are bad. I have installed the new ground sub harness and a new engine to body ground. I run the car for 10 mind to get it to operating temperature. The light doesn't come back on til I shut the car off and after a few minutes turn start it again. Sure enough the light is on. Can anyone tell me what's going on here?
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Old 04-06-2018, 06:01 PM
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Quote:
Originally Posted by larry_mcnair View Post
I have a 2000 Xtera also and like many others it keeps saying o2 sensors and knock sensor are bad. I have installed the new ground sub harness and a new engine to body ground. I run the car for 10 mind to get it to operating temperature. The light doesn't come back on til I shut the car off and after a few minutes turn start it again. Sure enough the light is on. Can anyone tell me what's going on here?
I would check the power supply to the sensors.
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Old 07-08-2018, 01:43 AM
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Default Xterra O2 sensor issue.

Quote:
Originally Posted by wtplv View Post
I have a 2000 Nissan Xterra V6 4x4 and it will not pass smog. I get P0135, P0141, P0155 and P0161 indicating that all four O2 sensors are bad and P0325 which indicates the knock sensor is bad. Is there a fuse for the O2 sensors and if so, which one is it? Also is there a fuse for the knock sensor?


I had the exact same issue. For 4 months I was back and forth trying to figure it out. The #14 fuse is a 15amp mini in the panel by your left knee when siting in the car. check to see if it is blown 1st and put in a new one. start the car and let it run for 5 mins. Turn off ignition for a min then restart the car if service engine comes back on check to see if the fuse is blown again. The thing is all of the codes u have coming up are for the O2 sensor heater circuit and they are all 4 on the same circuit. the easiest way to break it down is to get a few of the 15amp mini fuses then start one at a time unplugging each O2 sensor and starting and stopping the engine. Each time plug that one back in and unplug another. When you stop blowing the fuse you will have narrowed the problem to one sensor. before changing the sensor check to see if any of the wires are worn thru and allowing the heater wire to ground out. No fuse for the knock sensor and once you have figured out the O2 sensor problem the knock sensor code wont come back again. Unless your motor is supercharged the knock doesn't do anything so they don't go bad. This process can be a little time consuming but better than paying a garage hundreds. I hope this post helps you and a few other people because there are hundreds of people having this exact issue.
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Old 07-11-2018, 09:00 AM
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Well, I have to disagree about the knock sensor comment. They do "do something." They send a signal to the ECM when they sense engine knock so the ECM can retard the ignition timing to help limit damage. They also can go bad. This goes for supercharged and N/A engines. With the supercharged engine, it just goes a step further in that it cuts the boost.
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