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Hi, I have 2001 Nissan Quest. the car got a code for B1S2 oxygen sensor and let me failed the inspection.I bought the new one, inserted and the problem still there.I checked with

Hi, I have 2001 Nissan Quest. the car got a code for B1S2 oxygen sensor and let me failed the inspection. I bought the new one, inserted and the problem still there. I checked with Foxwell Automaster Pro and it showed System status Monitors N/A -3 Monitor OK 4 and Monitor NIC -3. Also, when I checked downstream o2 Sensor it show 99.2% and 0.3 V but there is no graph on running engine. When I turn off the engine and put only on the "ON" position the voltage change from 0.3 v to 0.29 v and showed the graph. The o2 sensor is good because i bought another one and the same situation happened. Moreover, there is no check engine light whatsoever. There is code but no check engine. I even disconnected the MAF sensor and there was no check engine. Also, the downstream o2 sensor located before catalytic converter as it kind of strange for me as i know it should throw the check engine light after that. Please help me with this riddle. Thank you

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Jeff McCrea

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I can't be specific to your car but generally speaking, the computers in cars are VERY sensitive to changes in their sensors. Especially ones that sense chemical changes. I would venture a guess that your voltage readings changed between "ON" and "RUNNING" because the oxygen levels changed between a static reading with "ON" and an active, ever changing reading while "RUNNING" No two drops of anything are the same. Especially gasoline. This is why the O2 sensor takes a multitude of readings every second and tells the computer how to micro manage fuel allocation just as often. When I said that no two drops of anything are the same, this goes for everything else. The, probably original, O2 sensors that you took out were programmed into your computer at the factory. When you changed them, even if you bought them at Nissan, when your computer first "saw" them it was probably thinking, "Hey, whose these two new guys and do they know what they're talking about?" I would call Nissan and tell them your story and ask if your ECM, (Engine Control Module), needs to be reset or reprogrammed to recognize the new parts. Good luck.

Posted on Jan 04, 2019

  • Igor
    Igor Jan 04, 2019

    Do you know if the downstream o2 sensor needs a spacer? Thank you




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Did you clear all code errors with a code reader reset tool?

Posted on Jan 05, 2019

Testimonial: "Yes I did. Also I drove at least 50 miles after. The code came back but there is no check engine light,that is very interesting fact..."


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SOURCE: Check engine light code P0171 activated on my 2001 toyota corolla

p0171 is lean condition bank one. you could have a vacuum leak a bad map sensor bad maf sensor clogged fuel filter low fuel pressure. start with the vacuum leak first.

Posted on May 05, 2009

Tommy Cude

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SOURCE: Replaced 0xygen sensor in 2003 Hyundai Accent 3 Times Not Fixed!

It sounds like you have either a lean or rich condition ocurring,could be exuast leak,vac leak,leaking fuel preasure regulator,cat convertor.At this point would go to dealer for diagnosis.

Posted on Jun 17, 2009


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SOURCE: 1999 GMC Sierra 5.3L knocking sound around Catalytic Conerters? ?

on my gmc i have 2 knock sensors and im not possitive if you have two or not under your intake mani but when i replaced both mine i got the same code of low input so i took the small needle out and wire brushed it clean and also traced and ran a new wire just to be safe and that solved my problem. as for bank 1,2 if it helps any my bank one is located engine side driverside and bank2 is engine side passenger side and 3 and 4 are underneath bed side. but you can see the sensors if you look real close near the headers. hope this helps
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Posted on Jul 02, 2009


Alexander Mimun

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SOURCE: P2097 Error code in 2006 Dodge Grand Caravan, which O2 Sensor?

The one before the catalytic, on the side where cylinder # 1 is at. close to the exhaust mag.

Posted on Dec 28, 2009

Steven Wingert

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SOURCE: 2001 Honda - New Catalytics & O2 sensors -- new 0420/1739/1456

I would send the car for a smoke test for the emissions leak...Find out where the leak is comming from..Repair it..Reset the codes, then do a drive cycle and see what happens...

Posted on Feb 19, 2010

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I have a 06 Corolla that is giving a P0037 code I have replaced the Oxygen sensor closest to the Catalytic converter Twice

it should be the o2 after cat converter ----and the following information courtesy of OBDP0037 HO2S Heater Control Circuit Low B1S2 OBD-II Trouble Code Technical Description Article by Dale Dale Toalston ASE Certified Technician Generic: HO2S Heater Control Circuit Low (Bank 1 Sensor 2) Nissan: Heated oxygen sensor (HO2S) 2 Bank 1 - heater voltage low What does that mean? Heated Oxygen sensors (HO2S) are inputs used by the PCM (Powertrain Control Module) to determine oxygen content in the exhaust system. Bank 1, sensor 2 refers to the second sensor back on bank 1. The PCM uses the information gained from the Bank 1,2 HO2S mainly to monitor the efficiency of the catalytic converter. Integral to this sensor is a heater element The PCM controls this heater to warm up the sensor to operating temperature. This allows the engine to enter closed loop faster and reduces emissions on cold startup. The PCM continuously monitors the heater circuits for abnormal voltages or in some cases, even amperages. Depending on the make of vehicle, the Oxygen sensor heater is controlled one of two ways. One way is that the PCM directly controls the voltage feed to the heater either directly or via a HO2S relay and a ground is supplied from the vehicle's common ground. The other way would be a fused 12 volt Battery feed (B+) that feeds 12 volts to the heater element anytime the ignition is on and the control of the heater is done by a driver in the PCM which controls the ground side of the heater circuit. Finding out which one you have is important because the PCM activates the heater under various circumstances. If the PCM detects an abnormally low voltage condition on the heater circuit, P0037 may set. Symptoms Symptoms of a P0037 DTC may include: Malfunction indicator lamp (MIL) illumination There will likely be no other symptoms Causes Potential causes of a P0037 trouble code may include: Bank 1,2 oxygen sensor heater element has failed Physical damage to heated oxygen sensor has occurred Control circuit (or voltage feed, depending on system) is shorted to ground PCM Oxygen sensor heater driver has failed === Possible Solutions== Do a visual inspection of the Bank 1,2 HO2S and wiring harness. If there is any damage to the sensor or any damage to the wiring, repair/replace as needed. Make sure wiring is routed away from exhaust. If all appears okay, unplug the Bank 1,2 HO2S and verify that there is 12 volts B+ present with the key on engine off, (or ground is present, depending on the system). Verify the heater control (ground) circuit is intact. If so, remove the o2 sensor and inspect for damage. If you have access to resistance specifications you can use a Ohmmeter to perform a resistance test of the heater element. Infinite resistance indicates an open in the heater. Replace the o2 sensor as necessary.

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Jul 28, 2015 | 2006 Toyota Corolla

1 Answer

Check engine light is on autozone gave P2270 after checking it? What does this mean?

This P2270 trouble code refers to the post-catalytic converter O2 (oxygen) sensor on bank #1, sensor #2.

Check this site:
P2270 O2 Sensor Signal Stuck Lean B1S2

P2270 O2 Sensor Signal Stuck Lean B1S2

Feb 28, 2015 | Cars & Trucks

1 Answer

P0732 gear incorrect ration

Most likely an internal problem, as the codes
come from sensors & sensors get their pulse
or signals from the internal mechanical rotating
components,so failed trans & expensive repair

Apr 23, 2014 | 2001 Nissan Quest

1 Answer


The P2270 is a fairly straight forward code pointing to a fault in the downstream heated oxygen sensor (B1S2). Basically, it's not switching in the alotted time that on-board computer needs to see. Carefully inspect the wire harness and electrical connector for any loose, broken, pinched or rubbed through wires. Make sure there are no current exhaust leaks in the system. If the visual inspection checks ok, replacing the sensor should solve the problem.Bank 1 is on the passenger side and sensor 2 is by the cataytic convertor.

Jul 14, 2013 | 2005 Ford Escape

2 Answers

What does the codes p0442,p0136 &p0141 mean on my 2001 ford taurus it failed inspection for these codes

P0442 FORD - Evaporative Emission System Leak Detected Small Leak

Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
P0136 - O2 Sensor Circuit Malfunction Bank 1 Sensor 2
Possible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

P0141 FORD - O2 Heater Circuit Bank 1 Sensor 2

Possible causes- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
- Faulty Engine Control Module (ECM)

Sep 27, 2012 | 2001 Ford Taurus

3 Answers

2001 Nissan Sentra. Car starts with no power, but after a few restarts, gain power again. Code is PO420.

Hi, P0420 code means a catalytic converter fault.
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter

Jul 22, 2011 | Nissan Sentra Cars & Trucks

1 Answer

What is nissan quest code p0138/p0139

P0138 - Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

P0139 - Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)

The Heated Oxygen Sensor (1 or 2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)

Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.

Causes: A code P0138 may mean that one or more of the following has happened:
* Faulty O2 sensor
* Short to battery voltage in O2 sensor signal circuit
* High fuel pressure (not as likely)

Here are some potential solutions:
* Replace O2 sensor
* Repair short to battery voltage in o2 sensor signal circuit

Hope helps (remember to rate this answer).

Oct 11, 2010 | 2002 Nissan Quest

1 Answer

My minivan will not pass inspection. I put over 2k in repairs but since the "low wiper fluid" light wont shut off my mechanic will not pass it for inspection. EVERYTHING in the car is up and running. All...

I assume you changed the sensor in the wiper fluid tank. The plug-in could be making poor contact with the sensor so try moving it on the sensor to see if that will put it out. If it does then change the plug-in. Try unplugging it and see if the light goes out. You could also try a jumper wire between the terminal ends. That may turn it off. If not then trace the wire harness for the wiper fluid sensor looking for a bare spot in the insulation on one or both of the wires. Tape up the bare spots. Hope this helps.

May 24, 2010 | 2001 Nissan Quest

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