Okay guys, I did some searching and I can't seem to pull anything definative up. I just got my Auterra up and running in my efforts to solve my performance and gas mileage problems. Today, I finally figured out how to pull codes with the thing. I pulled a 0136 which converts to a 0707. That is rear heated 02. The description in the sticky is kinda confusing. I have been getting between 225-275 miles to a tank where I used to get 400. When I graph my 02's I get very weird readings. They are within range but they often do not correspond to each other. I have been attempting to export it into a graph in excel but I'm not having much luck with that. Anyone have suggestions? What I think is happening is that one of the front 02's is bad and is causing the rear one to throw a code. Is this correct? I know this is often repeated but I'm getting tired of spending $60 a week on gas alone.

 

WOW thats bad only 225-275. I get about 400 and I have a 95 maxima gxe. Sorry I dont have any help but Ill look into it.

 

replace your O2

 

Rear O2 doesn't mess with performance or MPG. Maybe your other ones are slowly dieing too but have not thrown a code yet.

 

Reset the code and if it keeps coming back then replace it. I've here you can clean them with throttle body or carb cleaner instead of shelling out the cash for them.

I got that code a couple of times but the code hasn't come back in a long while now.

 

Well, guys, thanks for the input. I think I am one step closer to solving the problem. I figured out how to get the reading from the rear O2 and it is reading 0v during all driving. This is pretty much a dead give away that its dead, correct? I took a close look at all the sensors today and none appear to be leaking but it looks as if the rear has scraped the ground a couple times. I can't believe I didn't notice this before. One of the wires on the harness has been stripped bare. I think I got it. If anyone thinks otherwise please respond. Kevlo, you really think that the others fail without throwing codes? The reading of my bank 2 sensor is very irradic and doesn't correspond with bank 1 very much. At idle they both sit at .97-.99v but other than that they rarely follow a similar curve.

 

I have read that some o2 sensors don't make the computer send a CEL but are still going bad. All you can do is test them to make sure they are still good.

 

Well, thanks for the help guys I think I have it figured. My front o2's might be on their way out but my heated is definitely flat line as exhibited by this graph. You can't see the rear o2 because it is at zero at all times. I will order a Boosch unit tomorrow and hope to have it by Friday so I can enjoy the weekend without having to fill up twice.