Hi Guys! I am new here and also not having much experience with cars. I got emission failed with P0133, O2 sensor circuit slow response bannk1 sensor 1. I want to learn to replace it by myself this time. My car is 99 maxima GXE auto. My questions are: 1) what kind of O2 sensor I need? I went to NAP and was told: there are two type o2 sensor suitable for my car with part number as 15726 and 15727. Which is one right one for O2S1B1? 2) where is the location of O2S1B1? Do I need to lift my car to do it or just open the hood? I got the diagram from previous post and is that correct? see: http://www.jatan.net/02Sensor1.jpg.
3) how do to do it? Any special processes an tool needed to apply?
I appreciate all detailed helps!

 

There are two O2 sensor positions both are on the y-pipe - 1 going up towards the front header and the other going towards the rear. You need to crawl under the car to unscrew them. I don't know about the part #s

 

Thanks! Do I need to replace two O2 sensors or just one?

 

You should only have to replace the one that tripped the ECU. Soak it down with PB Plaster or a comparable penetrating oil before you go about removing it. The little plastic wire holders can be a bear to remove from thier mounts. I just cut the old ones off with an appropraite tool and clear the mount location out for the new wire holders and snap them in. Depending on which sensor you need to remove you may need an O2 sensor removal socket (google it). Otherwise an open end wrench might get you home.

 

Thanks for the kit information. I will try to get it before I start to work! However, can anyone comment on which type O2 sensor I should buy to replace 99 Mxima O2B1S1?

 

If you have room, vise grips can be very helpful in breaking loose a stubborn sensor.

 

Sensor # 15726 is the one you want ONLY IF your car is built to Federal emissions standard.

However, the diagram link you posted is for a California emissions car.

You better get all your info to match before you buy anything.

 

If your 99 has California Emissions you will see 4 connectors mounted on the front of the engine, just past the radiator just under the valve cover.

Your vin# should also detail that but I don't know how to decode, Nissan may be able to help.

B1S1 is bank one, sensor one.
Bank One on our VQ engines is the bank closest to the fire wall, back of the enigne compartment. Sensor One is the first sensor in the exhaust system for that cylinder head.

B1S1 isn't in a great spot, you might be able to see it from under the vehicle.
It's going to be up on the down pipe in the rear of the engine compartment right before the pre cat. A PITA to get at.

 

Thanks for all your help! My car is federal standard. Where I can find the correct diagram before I do the job? I found one part is as below. IS this one OK? I am not sure is before catalytic or not.



Replacement Before Catalytic Converter, Passenger Side Oxygen Sensor - OE replacement, 3-wire 1999 Nissan Maxima GXE 6 Cyl 3.0L -- OXYGEN SENSOR, HEATED, 3-WIRE -- 34.65 in. wire length; Threaded-in type; Includes male connector and easy-to-follow instructions; Quality tested to ensure efficient fuel combustion; A high quality, OE replacement oxygen sensor; Features stainless steel shell, hex nut, shield, Teflon-covered insulated wires, high-temperature rubber internal and external seals, and threaded tube coated with anti-seize compound; Helps reduce harmful emissions; Backed by 1-year, unlimited-mileage warranty.

Part Number: REPN960903
Location: Before Catalytic Converter, Passenger Side
Type: OE replacement, 3-wire
Quantity Sold: Sold individually
Warranty: 1-year, unlimited-mileage warranty

Availability: In Stock

Fits 1999 Nissan Maxima GXE 6 Cyl 3.0L

• 1999: GXE; 6 Cyl 3.0L; "GAS, FI, VQ30DE, Naturally Aspirated"

 

Sounds like you don't fully understand Nissan's designation of O2S1B1. It is 3 pieces of information, broken down as follows: O2 . S1 . B1.
O2 = Oxygen sensor. O2 is the chemical symbol for oxygen.
S1 = Sensor # 1, the first one from the cylinder head before the catalytic converter.
B1 = Engine Bank # 1. This is the bank next to the firewall in your car.

The diagram you originally posted is accurate as far as the location of this O2 sensor.

EDIT - here is a link to an O2 sensor locator diagram. It has the Federal car first, then the California car 2nd.

http://nissanhelp.com/diy/maxima/pro...tification.htm

 

Yes. I am very inexperience with Car.
Thanks for all information. Is that part posted OK? According to that diagram: the sensor should be under the neath of car so I do need to raise the car with Jack at front of car. and connector should be seen after opening the hood. Am I right? Please provide further advice!

 

The part you posted is the one you need. That has a very inexpensive price, so I hope it has good quality.

To change the O2 sensor, you need to work from the right side (passenger side) of the car. Jack up the car and remove the right (passenger) side tire. USE A SUPPORT STAND so the car does not fall on you. The electrical connector is on the top of the engine, you can follow the wire from the old O2 sensor.

 

http://www.youtube.com/watch?v=PXa6xMVIxno Heres an OK video...not on a Max but you will get the general idea of how to change the sensor. Make sure you spray some PB Blast on the area where the threads of the O2 sensor go into the pipe AND LET IT SIT FOR A WHILE (20-30 minutes or so) to make your life easier. The video also shows the "special" socket that you may need. I have always used vice grips if there is room which for the location you need to change, you may not have, but some auto stores like Advance Auto will let you borrow the O2 socket.

When you put the new sensor in, make sure to use some anti seize on the threads.

 

I recently replaced this one on mine. I pulled up on ramps but still had to jack it up a bit more on the passenger side and support it on a stand.

Then I was able to roll under and get to this. You should be able to see it sticking out from your y pipe RIGHT before it starts going flat down towards the back of your vehicle.

I found this one actually easier to get to since the other front one has the engine mount in the way.