HO2S Heater Control Circuit Low (Bank 1 Sensor 1) - Nissan Forum
QR25 2.5L Engine Engine Discussion: 2002+ Sentra SE-R and SpecV

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post #1 of 5 Old Sep 21st, 2010, 10:51 AM Thread Starter
Joined: May 2009
Posts: 10
HO2S Heater Control Circuit Low (Bank 1 Sensor 1)

2002 QRD25 Spec-V
This is the code: HO2S Heater Control Circuit Low (Bank 1 Sensor 1).
HO2S is Heated O2 Sensor. (Bank 1 Sensor 1.... Upstream correct?)

I first replaced with universal sensor (like$50), cleared codes, drove, code came back, I checked with several people and they said pay money for better OE exact sensor ($130 Bosch), I did, replaced, drove, code came back!
And car actually feels rough idle and low rpms now and didnt with the cheaper sensor.
I sensor tested plug (4 wire) for voltage and one of the terminals was putting out charging voltage of 13.8 vdc whatever so its getting voltage and obviously fuse isnt bad.
Im really beating my brains out on this one and I dont have any ideas what else to check.
Nissan dealer has $175 sensor... dont know what brand, but could I have coincidence of TWO bad sensors in a row, or does someone else know whats going on?

Greatly appreciated.

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post #2 of 5 Old Sep 21st, 2010, 11:45 AM
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Location: Prospect, VA
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It would have been helpful if you posted the code #. I'm assuming you have a P0031, which is B1S1 heater circuit. First thing to do would be to contact your Nissan dealer or the customer service hotline (1-800-NISSAN-1) with your VIN# and check for outstanding recalls and campaigns, as there have been a couple for your vehicle. If you're up to date, there was a TSB that addressed rough running and O2 sensor codes/MIL "on." This covered all 2002 Sentras with the QR25DE engine and codes P0031/P0132/P0133/P0134/P1144. TSB#NTB02-082 states to compare the exhaust manifold heat shield with those pictured on the bulletin. Old style shields covered the oxygen sensor while newer shields had a large cutout for the oxygen sensor. TSB states to replace the old style heat shield, if necessary, and replace the oxygen sensor with that listed on the TSB. That oxygen sensor would be P/N: 22690-8J010.

If you are still have issues, then you'll have to check for an open or shorted heated oxygen sensor circuit. At the B1S1 harness connector (yes, that's "upstream") you should have battery voltage at the blue wire with red stripe (with key"on" and sensor unplugged) and ground at the black stripe. If those are okay, you'll need to unplug the ECM and check the red wire with blue stripe from the B1S1 harness connector to pin #2 of the ECM harness connector for continuity with minimal resistance and no short to power or ground.
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post #3 of 5 Old Sep 30th, 2010, 12:03 AM Thread Starter
Joined: May 2009
Posts: 10
Correct on the code sir. P0031...

THANKS SO MUCH FOR THE HELP!!! I changed to the expensive sensor from nissan via VIN number and that did not work! I took car to local garage that I trust and they checked out everything, it was all good up to the point of no communication to ECU, something he thinks might be grounding or something but not sure. His suggestion was to unfortunately take it to dealer and get reprogrammed or at least find out what they say when they try to reprogram. ANY thought on this? I just saw another guy on here with almost exact same problem on 02 ,but it is 1.8l instead of 2.5QRD... I called about recals and they said my VIN had none outstanding. Could this problem possibly be a Nissan issue that they might fix for free!!! IM hoping!
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post #4 of 5 Old Oct 12th, 2010, 07:25 AM Thread Starter
Joined: May 2009
Posts: 10
Well, anyone still looking for info on my topic.... I had to break down and buy $185 sensor from Nissan. Replaced it, cleared codes, drove, and engine light came back on! I had to take to Nissan for $ 129 diagnostic for them to tell me that Chanel on ECM is shorted and I have to get $650 dollar computer and $350 for labor to replace! Ouch!!! I'm sitting in customer lounge as we speak. Praying that this is truly the end of it!
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post #5 of 5 Old Oct 14th, 2010, 01:04 PM
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Joined: Jun 2009
Posts: 6
wow, that sucks. is that a common issue with the 02 with 2.5QRD?

and did that fix your issue finally?
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