I have a 0304, which I know is a KS and I'm going to replace it, but I also got an 0707. According to the only table available now, ehem ehem, this is for the right rear heated O2. My question is this, there are two rear O2 sensors. One is before the cat on the back bank, and the other is right after the cat. I suspect is the rear bank one but not sure. Can someone please tell me for sure, so I can order both the KS and which ever one it is at the same time? Your help is greatly appreciated.

 

sorry im not answering the question man, how do you run the diagnostic ? search only brings me to a buncha codes

 

Look on Maximadriver.com under the how to section

SuDZ

 

The code you have is for "downstream oxygen sensor or circuit fault".
Downstream is after the cat. The code for the sensor before the cat would be 0503 "upstream oxygen sensor or circuit fault (right bank)".

I got this info from the Haynes Manual section 6-6. Hope it answers your Question.

 

welcome to the world of KS. Are you experiencing any symptoms? I have been noticing my car is slightly sluggish lately and checked the codes and KS it is.

 

The ECU is forward of and under the center console. Remove the protective cover which is to the right of the gas pedal. You should now be looking at the side of the ECU (about two inches high and six inches long). There is a flat-head screw recessed in a hole under a piece of tape on the end closest to the firewall. Turn the key to the "ON" position without the engine running. Remove or cut through the tape, insert a screwdriver and turn it clockwise (gently) until it hits the stop (about 3/4 turn). Wait about two seconds. Turn the screw back to its original position. Watch the CEL and count the flashes. Long flashes will be the first two digits and short flashes will be the second two digits. ----- ----- ----- , -- -- -- -- would be 0304. To clear the codes turn the screw clockwise again, wait about two seconds, and then turn it back. Turn the Key to the "OFF" position.

Sometimes the ECU will not reset on the first attempt so try it again if the CEL doesn't go away after you start the car.

Good Luck

 

Thank you. I will have to call and order that one tommorrow. Thanks for the info.

 

The code he has is 0707 which is Rear Heated O2 sensor not 0503, the ECU is telling him 0707, where are you getting 0503 from?

Second, Jaime, I believe you have a 95. 95-96s only have 1 (one)Rear O2 sensor, that's what you need.

http://www.courtesyparts.com/cgi-bin...de=226A0-00002

I used to have 0304 and 0707. A new Knock sensor took care of 0304 and Im awaiting my rear O2 sensor which should take out the 0707.

 

He was saying that if it were the rear bank O2 sensor it would read a 0503 code. I am a little confused here, according to everything I have read and even going back to VBXMaxima to compare, there are supposed to be 3 O2 sensors total: 1 in each cylinder bank and 1 right behind the cat. Is this not true? I am truly confused now, because according to courtesy nissan, there are two different part numbers and I want to make sure and order the correct one. Someone enlighten me.

 

Check this diagram out, this should clear up some confusion.

http://www.courtesyparts.com/A32_O2-sensors.html

 

its really funny to see how everyone is suddenly experiencing knock sensor troubles. i just changed mine out last week, and since then, i have seen/read more posts about the KS by so many other members, more posts related to teh KS than other things. weird...

 

That's the same diagram that I was looking at, but notice that there are 3 total sensors. My question is which sensor does the 0707 code belong to? The one on the rear cylinder bank or the one further back just past the cat? That's what has me confused. Someone please advice because I have already ordered the rear cylinder bank one because that's the one I thought it was.

 

You have a 95. All those other rear O2s in the diagram are for 97s and up I believe.

 

Seems like NIssan must be making some cash on these lately then. But think of how many out there dont even know there is a problem since it doesnt throw a check engine light.

SuDZ

 

No, look a little closer. The diagram shows that my 95 has a front bank sensor, a rear bank sensor, and a back sensor (the one near the cat). That's what has me confused, The code table says that 0707 is the rear heated O2 sensor. My question is which one is the rear heated O2 sensor, based on the diagram 2 sensors could be called rear O2 sensors (the one on the rear cylinder bank and the one by the cat). That's what I'm asking, since courtesy says that both sensors (in the rear) have different stock numbers, I figure I have to order the correct one.

 

As it has been stated many times, all of the information that was in the stickys was taken from regualr posts. Search IS your friend.



DTC 0707

Diagnostic Trouble Code 0707 points to a problem with the Rear Heated Oxygen Sensor. This sensor is mounted
in the exhaust stream, just downstream of the Three-Way Catalytic Converter. When the two Front Heated
Oxygen Sensors are operating properly the Rear Heated Oxygen Sensor is not used for engine control operation.
It is used to monitor the condition of the Catalytic Converter. If either (or both) Front Sensors fail, the Engine
Control Module uses the signal from the Rear Sensor to maintain a correct fuel/air mixture.

DTC 0707 is detected when the Engine Control Module determines that the response time of the Rear Heated
Oxygen Sensor is excessive. The possible causes include ...
- Harness or connectors (the sensor circuit is open or shorted.)
- Rear Heated Oxygen Sensor
- Fuel pressure
- Fuel injectors
- Intake air leaks



Please check the condition of the wiring and connector at the rear Oxygen Sensor. If they look okay, you ought
to replace the sensor. If you had a problem with fuel mixture I think you would have other DTCs in addition to
0707.

Your Maxima has three Oxygen Sensors. Two are front sensors, mounted in
the Y-pipe between the exhaust manifolds and the Catalytic Converter. One
is a rear sensor, mounted in the exhaust pipe downstream of the Cat.

When both front Oxygen Sensors are operating normally the rear sensor serves only to keep tabs on the
Catalytic Converter. That's the reason your engine is running well. The Engine Control Module (the computer) is
not using the signal from the rear sensor to control engine management functions.

For more information about Oxygen Sensors go to
http://www.volksparts.com/o2sensors.htm

For specific information about replacing Oxygen Sensors on your Maxima see
the Chilton manual (page 4-13) or the Haynes manual (page 6-14).

 

I did the search, but the confusion came in when there were (in my opinion) 2 that were called rear O2 sensors. I was just trying to get a definite answer as to which one of the two it was. Basically, you are saying its the one right past the cat then?

 

correct.

 

In the Haynes manual 0707 is clearly for the O2 sensor by the cat, not the one in the rear (right) bank. All the codes for the other sensors specify which one the code is refering to, either left or right bank. After reading the section in the manual which deals with the replacement of the O2 sensors there are indeed three sensors total in the exhaust system of a '95 (which is the same year I have). It also says that all three operate the same way but the two Upstream sensors give feedback to the PCM which will compensate for air/fuel ratio in that particular bank. The Downstream sensor is not used for PCM control of the air/fual ratio but is used as a monitor for the catalyst system and it will produce a slower fluctuating signal that will reflect the lower amount of oxygen after the cat.

There are a sh!tload of codes in the Haynes manual and I would strongly suggest you pick one up.

I hope this won't confuse you more than you already are.

 

Thanks guys. I just ordered both the KS and the rear (cat) sensor today. I will definetly pick up a Haynes manual. Is this the one you get at like AutoZone?

 

Yeah it's the same type you find at Autozone or Advance auto. Good luck finding it there though, they always have tons of Civic and Ford F-150 manuals but a Maxima manual is hard to find.

I got mine on Amazon.com for 12 bucks.