Question about Chevrolet Silverado

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Have 1996 chevy Silverado 4.3 Service Engine Soon Light Stays on took to Autozone & the reader said replace O2 Sensor

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  • Lrocker May 01, 2010

    Not Sure I'll Ask for code # tomorrow . He said reader said O2 Sensor , We Look at the 1 by the Cat. Convrtr

  • Lrocker May 01, 2010

    Just bought this truck I believe the fuel pump has been Changed & the Gas Cap doesn't not Pressurize . Have been getting Check Engine Now ! Needs O2 Sensor , the Dude at Autozone said thats what the reader Said

  • Lrocker May 04, 2010

    I'm getting a P0147 (Bank 1 Sensor 3) Heater Circuit & P0153 (Bank 2 Sensor 1) Slow Response. Any Help Is Appreciated. Thank You !

  • Lrocker May 04, 2010

    Hey Dan the man at autozone said That P0147 (bank 1 Sensor 3 )Heater Circuit is the Sensor before the catilatic converter is that correct thers 4 sensors total, There 1 on driver side exhaust 1 on passnger side the 1 before catlatic converter & 1 After catlatic contr

  • Dan
    Dan May 11, 2010

    The guy that posted the first solution most likely may be correct because it is a common fix [depending on what the code is]. The code reader at auto zone does not tell you it is a bad O2 sensor, the code means the sensor is giving a bad reading, there are many possibilities that can cause the sensor to give a bad reading.

    Let me give you an example: If you have a clogged fuel filter; you will have low fuel pressure which will make the engine run lean. This will result in a bad O2 sensor reading, thus causing a check engine code. This is just one of many possibilities. You have a 10+ year old vehicle, an old intake manifold gasket can cause a bad O2 sensor reading. Since you have an older domestic car... ALL parts are dirt cheap!!!

    The reason I ask what the check engine code is is because I just want to have a better idea of what to look for. Find out the code number(s) and let me know :) I'll tell you where to look next.

    Tho code should be a letter P followed by 4 numbers.

  • Dan
    Dan May 11, 2010

    What is the check engine code?

    Is it a P0171?



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A P0147 is caused by a failure in the O2 sensor heater circuit. The heater circuit is used to allow a more accurate reading (for O2 sensor) while system is below normal operating temperature. The only way to properly fix this problem is to replace the O2 sensor, however you can clear the code and it may be a few days before it comes back [and sets check engine light]. This condition is somewhat common on GM vehicles of that age.

Posted on May 04, 2010

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  • Dan
    Dan May 04, 2010

    Bank one is the side of engine where cylinder #1 is. Sensor 3 is the 3rd sensor on exhaust pipe (bank 1 side).

    Not all cars have four O2 sensors, some cars have 3, some could have 6. Same with catalytic converters, some cars can have 1, some can have 6.

    You need to first locate sensor 1, it may be located directly on exhaust manifold or right next to it (attaches into exhaust pipe). Sensor 2 is the next one down the pipe followed by sensor 3... or just look for a sensor after the last catalytic converter.

    Before you try taking it out let some PB blaster or WD 40 soak into it. And if you don't have access to spark plug sockets you might need a flared end wrench or a crows foot to get it loose. The new part might have a little bag of grease like stuff, just smear it on the threads of the new sensor and install. When you tighten it, just a little tug with an open end wrench is good enough. If you over-tighten it, it will be difficult for the next person to remove (a little tip for you in case you have to do it again 3 years later).

    Good Luck!


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I would replace the O2 sensor, they go bad alot in these vehicles. I've replaced alot of them.

Posted on May 01, 2010

  • James Milzheimer
    James Milzheimer May 04, 2010

    The previous response is very true. But from what codes you have, I would say you have some bad O2 sensors.



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