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  1. #1
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    Default Change O2 sensor and Spark plugs and more.

    Usually most of sentra have almost 25~30 MPG. Maybe 20 miles even if pretty bad one.
    I expect mine is too. But…



    What the…
    It’s almost 11 miles per gallon. Surely somewhere is wrong particularly fuel system or delivery parts.
    I have to do something for that.
    So, I decided to change Spark plugs and O2 sensors by myself. I thought labor is too expensive considering difficulty level of work. And very easy to find “how to~” guides.





    ▲Bought parts on eBay and Amazon.
    - NGK Laser Platinum spark plugs
    - NTK Oxygen Sensor
    - Lucas Injector cleaner

    And I realized the biggest problem remained. I don’t have any tools. -_-;;;
    So, ordered some tools and air filter too.





    - 5/8” spark plug wrench socket
    - 7/8” O2 sensor wrench socket
    - 10mm wrench socket
    - Socket extension
    - Wrench
    - Multimeter
    - Denso air filter





    ▲Here is my engine. Let’s start spark plugs first.





















    ▲Install new one





    ▲Cylinder 1





    ▲Cylinder 2





    ▲Cylinder 3





    ▲Cylinder 4


    Spark plugs change done.


    Engine light does not on at that time.
    But I want check these O2 sensors are really work. So, connect output terminal of the O2 sensor to multimeter and check voltage level.







    The result is




    I thought problem is two downstream sensors’ failure. after this work, engine check light on suddenly…-_-...
    Anyway I'm not surprised by that because I already knew something wrong with O2 sensors. Even, I expect that code makes me sure my analyze.


    So, I tried to read OBD-2 code using by “pedal dance” and found two codes.
    - 0031 (Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 problem or circuit)
    - 0051 (Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 problem or circuit)

    O2 sensor’s fuse was good. That means, both Up stream sensors are in trouble.
    “Ok, let’s replace up streams’ first.”

    Sensor 1 (up stream) s are blue wire and black wire.







    ▲Remove old sensor





    ▲Unboxed brand new sensor.











    ▲Replace left sensor was interrupted by cable guide. So remove guide.


















    Ok. OBD-2 codes are solved.






    ▲Refilled engine oil ; Castrol 10W40 part synthetic



    Fill up 3 Gallon when gas gauge mark on “E”. Reset an odometer as well.




    Ok. It’s done.

    So, Total cost was



    NTK 24573 and 24645 O2 sensors cost are $ 141.26
    Except these two sensors, actual total cost is $ 254.82

    All these for $254.82. sounds not bad.
    - Replace two Upstream Oxygen Sensors (NTK 24297 & 24298)
    - Replace all spark plugs (NGK Laser Platinum)
    - Replace Air filter (Denso)
    - Put Injector Cleaner (Lucas)
    - Refill Engine Oil (Castrol 10W40 part synthetic)



    I've never done this before. even didn't know how to change Engine Oil. but I’ve done a pretty good job.
    Thank you so much for all of your help. thank you guys.
    .

    .
    Let’s see what happen next.
    .

    ---------------------------------

    Solved Problem!!!!!!!!! ▼
    http://www.b15u.com/troubleshooting-...ummer-mpg.html
    Last edited by white glove; 06-20-2011 at 08:54 PM.
    My fuel....T_T

  2. #2
    Senior Member
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    Default

    most of the time its just fouled spark plugs and a dirty airfilter that will reduce your mpgs, that and driving habits.

    Hope you had fun.

  3. #3
    Member Ashwin
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    Nice post...let us know the outcome

  4. #4
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    That oil I think is to thick. I would have stuck with what is recommended; 5w30.

    Can anyone read spark plugs? I wonder what story yours will tell. Also did you index your plugs? As in, have them all facing the intake side.

  5. #5
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    Default

    Quote Originally Posted by njord View Post
    That oil I think is to thick. I would have stuck with what is recommended; 5w30.

    Can anyone read spark plugs? I wonder what story yours will tell. Also did you index your plugs? As in, have them all facing the intake side.
    is 10W40 bad for good MPG?
    I saw this article on owner's manual,

    "SAE 10W-30, SAE10W-40 viscosity oils may be used if the
    ambient temperature is above 0F (-18C)."

    and I live in Atlanta. here is veeeryyy hot...
    around 70~90F. that's why i choose 10W40.
    My fuel....T_T

  6. #6
    Senior Member Rico
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    really nice presentation. So I guess this increased your fuel economy?

  7. #7
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    If you want to run 40 weight, then get 0w40. Mobil 1's 0w40 has some of the highest zinc and phosphorous at 1100 and 1000 ppm.

  8. #8
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    your plugs looked just fine. the tips had good color, now if they were dark brown to black i would have been worried but yours looked almost lean.

    your real problem was that you drive a gxe/1.8 hahaj ust kidding man. damn nice right up and way to go with jumping in and doing your own work! i bet you felt great when you were done.
    Last edited by superspec; 06-24-2011 at 02:37 PM.

  9. #9
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    4 o2 sensors???? holy crap

  10. #10
    Senior Member B15 Bruin
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    Very good write up. And that oil should be fine, but I would personally go for 10w-30--if you're not burning any oil. It could save you an mpg or two.

 

 

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