Sorgasm

My 95 Max hit 100K miles on Christmas day and then today I get a CEL for the first time. I ran the code and got 0707 which the ECU Error Code Decoder defines as "Rear Heated O2 sensor" and the Haynes Manual calls "Downstream oxygen sensor or circuit fault" or "Downstream oxygen sensor circuit slow response fault."

Has anybody had this code before? What do I need to do? Just replace the sensor? If so, how difficult of a job is it going to be? Thanks in advance.

Brian

JSutter

iTrader: (46)

yes been there. its one sensor in the cat that needs to be replaced. All you need is the O2 sensor and an O2 sensor tool (usually 1/2" drive) and ratchet. the tool is basicly a deep socket with a chunk taken out for the wire to pass through. it should take you all of 30 minutes. its located in the cat, has a wire comming out of it. jack up the car, use jack stands!! just disconnect the wire, remove the old sensor, and intall the new one and hook up the wire. use some antiseize on the threads of the new one too.

BEJAY1

iTrader: (19)

The tool is nice but if you're careful a wrench should work well too. Just be careful with the leverage needed. At 100K your's is probably pretty well stuck/fused on there.

Of course if you have a meter check the sensor before replacing entirely. (but it's probably bad)

Max Noob

iTrader: (5)

nissan uses bosch o2 sensors from the factory..so buy that one.. its should be 60 bucks at online stores. i think i went to foreigncarpart.com.. u could buy the more expensive ngk one.but tis no point when bosch makes the factory one.

jsouth

My 95 Max SE (136K) had that problem last month. The old sensor was REALLY stuck in the cat -- it was tight all the way out. The wiring goes inside the passenger compartment under the drivers seat. I removed the seat for easier access (2 electrical connectors and 4 bolts with my air ratchet). The seat won't need to come out if you can find the connector. It's next to the hump, under the carpet, about 4" behind the front edge of the seat rail. There's even a hole in the carpet for access. The weather boot where the wire passes through the floor is a little tough to install, but it will eventually go.

When you reinstall the sensor, don't overtorque -- it can cause failure of the sensor. Spec is 13-17 ft-lbs.

Clear the CEL after you're done.

James South
95 Maxima SE (mine)
96 Maxime GXE (wife's)
72 Datsun PL510 (fun car)

Sorgasm

Thanks guys. Any more suggestions on the cheapest place to find a replacement sensor? How much would it typically cost from a dealer?

Max Noob

iTrader: (5)

http://www.oxygensensorwholesale.com...maxima_se.html

55 bucks.. there u go.. have a good day..

dealer price was 100+ if i rememerb right.

boris

Be careful, these sensors will not fit your car because of the different thread size. Either the O2 tools, they are larger (14mm vs 12mm, if I can remember well). Be sure, it’s the rear O2, for in cat installation. You don’t need to remove the seat: just pull the plastic grommet out to locate the electrical connector.

Sorgasm

Thanks boris. I didn't think that looked right.

Eric425

No they don't. Nissan uses NTK (division of NGK) from the factory. My sensors haven't been changed before, and they are all NTK. Bosch is just OEM style, not OEM. Also, the link you gave is for the pre cat sensors, the two in the y-pipe. The guy needs the sensor behind the cat.

Sorgasm

On http://www.buyoxygensensors.com/ they have 2 Downstream Sensors. One by Walker (part # 250-23505) that it says is OEM for $59.99. The other is by NTK (part # 250-23880) that is labeled Universal for $79.90. Should I go with the more expensive NTK over the Walker? I just want the best part and will spend the extra dough if necessary but if there isn't going to be a difference then I'll go with the cheaper one.

boris

This is exactly what I’m talking about. They both will not fit our car. I’ve made this mistake myself, ended up at auto part store, where I could see directly what I’m buying.

Sorgasm

I thought you were saying the ones from www.oxygensensorwholesale.com don't fit. You're also saying that these 2 from www.buyoxygensensors.com that say they are downstream sensors don't fit either?

boris

Here is where I ordered it from and then got the returning troubles.

Sorgasm

Damn. OK, can somebody please tell me where I can get one that will fit from at a good price since buyoxygensensors.com doesn't seem to be a good place to get them from?

95bluse

iTrader: (1)

You can do like I did and reset the CEL. I switched to Sunoco 94 and the CEL doesn't come back on as often as it once did. The rear 02 sensor has no effect on performance or fuel mileage, it's there for diagnostics only.

boris

There was the recall for emission components for some maximas 95-96. Try to find it out first. May be you have a luck...

Eric425

Boris, what are you saying? There's no replacement sensor available for the rear o2 sensor? That can't be right. Where'd you finally end up getting your sensor?
Hey if there's no available sensor, why don't you take your old one, bring it to a dealership to look at their sensor, check to see the threading matches, then get the part number from them? I thought it was 24072 (NTK), but go have a look to be sure.

boris

I got mine in the local auto part store.

Max Noob

iTrader: (5)

r u sure the cat sensor is different than the y pipe senors?.. i bought the boscj one.. it fit great in my stillen y..

and im positive, at least on teh 95 that bosch makes the factory y pipe 02 sensors.. i still have my old ones. they say nissan on them.. and they are bosch.

Eric425

Yeah the cat sensor is different. Different lengths, the plug in looks different, etc. How do you know that the sensors you have are bosch? Just cause they look the same? Or is there actually a bosch badging on it? None of the sensors on my car say nissan, or the oem fuel filters I buy from Nissan or headlight sockets, etc. Just made in Japan. We know that Nissan uses NGK spark plugs from the factory, it'd make sense for them to use the same manufacturer for all it's applicable products. But hey, it don't matter that much as long as it works. If we really wanted to know, we could call nissan and ask specifically.

Sorgasm

I should have tried this when I pulled the code. Hopefully if I do the reset it, it won't come back and I won't have to worry about finding a replacement sensor.

Max Noob

iTrader: (5)

my o2 sensor says nissan and bosch on it..its engraved.. bosch makes the factory y pipe 02sensors..i dont knwo about the cat..

Sorgasm

Just to update incase somebody gets this code in the future and refers to this thread. I went back and reset the ECU like I should have done after I first pulled the code and the CEL hasn't come back. I guess it was just a false alarm. Thanks to all for your help.

apbrian112

how long has it been since you reset your ecu? i did it to mine and after a while the light came back on. but even after it came back on it wasn't affecting my performance so i didn't worry about it. i should try switching to a higher octane gas.

maxspeed96CT

iTrader: (9)

help me out guys, http://forums.maxima.org/showthread.php?t=275876

Sorgasm

It's been about 4 or 5 days since I reset mine and it hasn't come back yet.