Last post on Jun 23, 2011 at 3:26 AM
You are in the Nissan Sentra
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Nissan Sentra, Fuel System, Sedan
#1 of 47 nissan sentra bank 1 oxygen sensor problem
Jan 10, 2007 (10:28 am)
Hi everyone thanks for helping me out. I have sentra 2002 SE-R, when the check engine ligtht came up few days ago. I took it into dealer for checking, they said it's my bank 1 oxygen sensor and ISC throttle chamber problems. I woulder if anyone have the same problem before? and if anyone knows what cause those problems. Also if there is a way of clean them.
I want to take them in, but after reading some forms about other owners took in to fix other similiar problems but still have the light came up few months later. So, I also wounder if it's worth to take in.
#2 of 47 Re: nissan sentra bank 1 oxygen sensor problem [chunyuchen33]
Jan 10, 2007 (5:33 pm)
There are 2 oxygen sensors in the bank 1. First one is important and if not fixed can cause major problems since it controls air-gasoline mix to the engine. It is located in the engine compartment.
If it is bank 1 sensor 2 then it is not critical at all. The only thing it does is the exhaust check for information purpose.
Double check with dealer which sensor it is. There are number of devices on a market (OBD II readers) which can read the code and reset it if needed.
#3 of 47 Re: nissan sentra bank 1 oxygen sensor problem [lgoldin]
Jan 10, 2007 (5:54 pm)
it's HO2 sensor 1, bank 1. Is this one you are referred to?
and what about ISC throttle chamber? is this important, too?
#4 of 47 Re: nissan sentra bank 1 oxygen sensor problem [chunyuchen33]
Jan 11, 2007 (9:54 am)
Yes, sensor 1 is important one. You better get it looked at quickly.
I think that these 2 problems are linked. Probably bad sensor (best case) fools computer and it says that idles are too high or low. Does you car run normally? What are RPM at idle?
#5 of 47 Re: nissan sentra bank 1 oxygen sensor problem [lgoldin]
Jan 11, 2007 (5:53 pm)
I already have them look at, those were the two problems. The normal RPM during the beginning of cold engin is about 1500 RPM, but after the engin heat up, the RPM will back below 1000 RPM, like about 600 to 700 RPM. And my car run normally. so, is the RPM in the normal area or too high or low?
#6 of 47 Re: nissan sentra bank 1 oxygen sensor problem [chunyuchen33]
Jan 12, 2007 (8:35 am)
RPM looks in a good range. Try to replace sensor. You can do it yourself. It is very well accessible. You'll need special key. The sensor itself runs about $100. The key about $15. But you'll need to see if the problem is fixed and therefore you either need OBD reader or you'll have to pay dealer again to connect the reader and tell you what they see.
#7 of 47 Re: nissan sentra bank 1 oxygen sensor problem [lgoldin]
Jan 15, 2007 (12:14 pm)
I have a 2001 Nissan Sentra SE,and had service engine light on for a few months,and took it to Nissan who told me Oxygen sensor ,Bank 1 Sensor 1 was bad ,so I purchased one from Auto Zone and installed it ,had light cut off but it came back on 2nd time I drove it,so I took it back,and Nissan told me it was still showing the same code ,so I took the sensor back out,and had AutoZone replace it as defective,then I installed with same result,now I have taken to independent repair shop who seems to think it may be ECM Board which had to be purchased thru Dealership ,yet dealership hasn't told me this needs to be replaced,and truth is ,I don't know what to do at this point in time,and car inspection is out now,and can't be inspected with service engine light on,can anybody help me with this situation ?
#8 of 47 Re: nissan sentra bank 1 oxygen sensor problem [fishface]
Feb 27, 2007 (10:08 am)
Any update with the 20O1 sensor problem? I'm having pretty much exactly the same problem with my 2002 Sentra SE, and after visiting 3 dealerships I'm inclined to agree with the second dealership's opinion: it's the ECM.
The thing is, there was that recall on the ECM foam casing which you've probably already had performed, and the reason for the recall was, some acidic material in the foam casing could eat away at the ECM. Since we were never notified of the recall, it did not occur until the ECM was encased for 4 years. Quite likely, it's not until the ECM starts crapping out that people finally bring the car in to be serviced. They replace the foam and it's already too late.
One sad thing is, the ECM costs a good $500. I (and your mechanic) hate to spend $500 just on a hunch. What's more, I happen to be in the semiconductor business, and I know those microcontrollers don't cost anywhere near $500 to manufacture. Nissan is making quite a profit off of those parts. If they had notified us of the recall, it could have been done on time and we would not need new ECM's.
#9 of 47 Re: nissan sentra bank 1 oxygen sensor problem [tetleytea]
Mar 13, 2007 (1:15 pm)
I know I'm a little late on this conversation but I have a question. When the ECM Board fails, does that cause the sensors to fail? I have my car at a dealership as we speak and I just spent $570 to fix the 02 sensor and have the system flushed...but now they are telling me it's the ECM Board that has failed (which will cost another $740 to fix) and that fails it causes the sensors to go out. Being a woman makes it that much harder to tell if a dealership is being honest or not.
#10 of 47 Re: nissan sentra bank 1 oxygen sensor problem [tquin]
Mar 14, 2007 (5:00 am)
Dealership kept telling me sensor was bad,so I purchased exact bosch sensor from local parts house and replaced it,then I took it back because light was still on,they again told me sensor was bad ,except the other upper sensor,so again I replaced it with correct sensor from parts house with same result,so this time I told dealership to keep my car until fixed,and they called me next day and said it was my emmissions computer at which time they told me that I had an 80,000 mile warranty on emmissons ,so it was covered under warranty since I had 78,000 miles on car.My question for you is this,first of all ,whats your mileage on your car ? If under 80,000 miles which is what I was told the emission warranty is,demand that they replace under warranty,if over 80k ,then I would ask them to show you which sensor is out ,there are 4 oxygen sensors on the sentra 1.8 engine,2 upper and 2 lower,it will more than likely be one or both of the upper sensors which you can purchase at Autozone for about 115.00 ea.,make sure you ask for the one with the factory plug on it,and ask the guy at autozone if he can take it off for you ,he may or he may not be willing to do this for you, if not they rent the special tool to remove it with,it takes about 5 minutes to remove and replace right on the front of the engine,ask the autozone sales person to point the sensor out to you on the very front of the engine ,and if he won't take it off and put the new one on ,then ask a male friend or family member to unscrew it with the tool from autozone (screws on and off just like a spark plug ,only it has wires coming out of it with plug on other end).If after replacing and driving about 50 miles your check engine light is still on ,take back to dealership and tell them that sensors have been replaced and light is still on and demand that they check it again.You have to drive the 50 miles or so before computer will reset and turn the light off.Hopefully ,you are not over 80k miles on your car and dealership will cover under emission warranty,if not you and a male friend (it takes a little strength to get the sensor to break free)can do the replacement and save you probably 400.00 or so that the dealership would charge in labor to replace 2 upper sensors.I am really sorry that the dealerships try to take advantage of anybody that it can(especially women),and also they have an ongoing problem with their computer and their sensors as well,though they will not admit it.Good luck,I hope this helps you,let me know how it turns out. Andy F.