Thread: Check engine light help!!!

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  1. #1 Check engine light help!!! 
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    I have a 04 gtp. Check engine light came on, p0141 downstream sensor. So I replaced it, had code reset, 3 days later, this morning tje light came back on and hasnt gone off?? Any thoughts would be great.
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  2. #2 Re: Check engine light help!!! 
    I live here. Slick2500's Avatar
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    Check the wiring harness.

    Possible Solutions
    Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
    Repair short or open or high resistance in wiring harness or harness connectors


    Read more at: http://www.obd-codes.com/p0141
    Copyright © OBD-Codes.com
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
    Quote Originally Posted by The Sunfire Guy
    Superchargers take away horsepower
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  3. #3 Re: Check engine light help!!! 
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    Yea that was my next step. Should I check the ecu were it runs to? Looks like under the air box I glanced after work tonight were it ran
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  4. #4 Re: Check engine light help!!! 
    I live here. Slick2500's Avatar
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    No check the part of the wire harness that comes off the back side of the engine and goes down under the car, that is most likely where the bad spot is.

    Sent from A Galaxy Far Far Away
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
    Quote Originally Posted by The Sunfire Guy
    Superchargers take away horsepower
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  5. #5 Re: Check engine light help!!! 
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    Ok will do and ill keep you posted. Had it scanned before work this morning same code p0141. Got told that it could be the cat converter,and that bank one sensor two is the front sensor by the header? Incorrect I thought it was the downstream passed the cat?
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  6. #6 Re: Check engine light help!!! 
    GrandPrix Junkie
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    Bank 1 sensor 1 is the one is the exhaust manifold that blocks easy access to #6 spark plug. Sensor 2 is post-cat converter.
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  7. #7 Re: Check engine light help!!! 
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    Exactly what I thought so I replaced the right one. Gunna check fuses and wiring and go from there really frustrating tho
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  8. #8 Re: Check engine light help!!! 
    I live here. Slick2500's Avatar
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    Quote Originally Posted by FordMan77 View Post
    Bank 1 sensor 1 is the one is the exhaust manifold that blocks easy access to #6 spark plug. Sensor 2 is post-cat converter.
    Yes but this code is bank 1 sensor 2. P0141

    Sent from A Galaxy Far Far Away
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    Superchargers take away horsepower
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  9. #9 Re: Check engine light help!!! 
    GrandPrix Junkie HighOctaneRacing's Avatar
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    Hmmmm. I would check fuses. My 97 used to tell me my downstream o2 was shot whenever I blew the cig lighter fuse. Since its an 04, I don't think it's the cig lighter fuse but might be worth checking out.

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  10. #10 Re: Check engine light help!!! 
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    Quote Originally Posted by Slick2500 View Post
    Yes but this code is bank 1 sensor 2. P0141

    Sent from A Galaxy Far Far Away

    bank 1, sensor 2 is the post cat o2. we only have one bank with 2, o2 sensors. up and down steam.

    and its the heater circuit code. means the heater inside the o2 is failed. so bad wires, or its a bad o2 you got try a delco

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  11. #11 Re: Check engine light help!!! 
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    Im finally off work tomorrow so Im gunna check the fuses first, then the wiring. Just sucks the the wiring has that protected crap around it so u gotta cut it off to even see them. Hoping for a fuse. And as far as the o2 sensor being bad I dont wanna waste more money and put another one in and it still be on
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  12. #12 Re: Check engine light help!!! 
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    What brand o2 sensor did you buy?

    Sent from A Galaxy Far Far Away
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
    Quote Originally Posted by The Sunfire Guy
    Superchargers take away horsepower
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  13. #13 Re: Check engine light help!!! 
    I live here. Slick2500's Avatar
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    Quote Originally Posted by Caloia1 View Post
    Im finally off work tomorrow so Im gunna check the fuses first, then the wiring. Just sucks the the wiring has that protected crap around it so u gotta cut it off to even see them. Hoping for a fuse. And as far as the o2 sensor being bad I dont wanna waste more money and put another one in and it still be on
    There is about 3-4 feet of wire for that sensor that isn't in the harness.

    Sent from A Galaxy Far Far Away
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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    Superchargers take away horsepower
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  14. #14 Re: Check engine light help!!! 
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    The brand was ultra power. Found online for $35 bux. And yea ill check that 4 foot section,but if theres nothing there damaged I probably need to check the harness after that wouldn't u think. Im pretty good with cars but never really diagnosed a check engine light code like this.
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  15. #15 Re: Check engine light help!!! 
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    And that Sensor was a bi### to get out by the way. Had to put on a lift and use a 3 foot breaker bar
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