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Diane Conklin
Diane Conklin Posted on Feb 10, 2010
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2003 Hyundai Elantra GLS. Check engine light, code PO133

2003 Hyundai Elantra GLS. Replaced 02 sensor, light was off for approx. 5 days, then returned. Code PO133.

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  • Posted on Oct 27, 2014
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The also is an evap sensor.That can cause a Check Engine light.Over filling your tank will cause the media in your evap canister to swell.Sometimes causing the charcoal to clog evap line.To replace the canister is fairly easy.The part can be pricey.

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  • Posted on Feb 11, 2010
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Did you use a aftermarket O2 sensor or a genuine Hyundai one? If it's an aftermarket one it may be bad or not as good as the OEM one. See here for more details and other potential causes: P0133

  • Anonymous Aug 15, 2011

    My check engine light has come on 5 times. 3while under warranty
    I was told i over fill my gas tank & they "fixed the problem." Now while the warranty has expired. I was told its a bad sensor

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