Question about Nissan Cars & Trucks
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
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
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..."
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
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
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
Posted on Jul 02, 2009
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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