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Thread: Oxygen Sensor replacement--HELP!

  1. #1
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    Oxygen Sensor location on a 94 Silverado

    I want to change the oxygen sensor on my 94 Silverado, 2x4, 5.7L. I looked where the ALLDATA diagram shows where it is located but it's not there. Does anyone know where it's located. Am I'm losing it or what? To me this is showing it is on the driver side, on the exhaust manifold.

    Thanks in advance for any help!
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    Stock 94 Silverado; extended cab; 5.7

  2. #2
    Senior Member 03chevy's Avatar
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    look further down off the manafold about 12" down and i can not remember if they have them with the cats too.
    A dirty mind is a terrible thing to waste!

  3. #3
    Senior Member rdhack's Avatar
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    Look on the passenger side just before the Cat converter. You probably have to lay on your back looking up. It is probably a 3wire.
    MY first truck was a FORD.......I've owned Chevy's ever since.

    1995 K2500 4x4 5.7L Cheyenne
    1991 T-10 Blazer 4.3L Tahoe Package
    2000 Ford Taurus - Spouses

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    Quote Originally Posted by rdhack View Post
    Look on the passenger side just before the Cat converter. You probably have to lay on your back looking up. It is probably a 3wire.
    OK thanks,I'll have a look today. The Sensor that I bought has one wire, though. Hmmmmmmmmm......... I'll let you know.
    Stock 94 Silverado; extended cab; 5.7

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    Quote Originally Posted by rdhack View Post
    Look on the passenger side just before the Cat converter. You probably have to lay on your back looking up. It is probably a 3wire.
    That's where it was and it is a 3 wire. Looks like it going to be kind of tough reaching in and connecting the wires. Any suggestions? Thanks for your help!
    Stock 94 Silverado; extended cab; 5.7

  6. #6
    Senior Member rdhack's Avatar
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    I warmed my truck up for about 5 minutes. Used an adjustable wrench with a cheater pipe to initially break it loose, then used a O2 socket for the rest of the job. get your tools ready before warming up the truck.
    MY first truck was a FORD.......I've owned Chevy's ever since.

    1995 K2500 4x4 5.7L Cheyenne
    1991 T-10 Blazer 4.3L Tahoe Package
    2000 Ford Taurus - Spouses

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    O2 Sensor--Help

    OK, so I've got my new sensor, my tools ready, the truck is jacked up but I've no idea how I'll be able to connect the sensor. The connector is back where I cannot (I think) reach. The wire coming from the truck doesn't seem long enough. Any suggestions?
    Thanks in advance,
    Jess
    Stock 94 Silverado; extended cab; 5.7

  8. #8
    Senior Member junior3382's Avatar
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    there should be a plug right in the back of the O2 sensor.... unless it is one of the older ones, and even then, it should reach unless it has been altered from stock. But if that is the case, how are you at cutting and splicing? LOL.

  9. #9
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    mudseeker's Avatar
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    there is a plug and yes, they are a pain to reach sometimes.
    one end of the plug is most likely connected to the body or frame with one of those annoying little plastic tabs.

    as a last resort, do as junior said and snip, snip
    <----just your average 5.3

  10. #10
    Senior Member 87c10slammer's Avatar
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    How long is the new wire comming from the sensor. That is where the old connector should be unless its the wrong part. It happens quite often i would double check your part numbers first. Perhaps remove the old one and take it to the parts store with you

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