Gdarn check engine light !!!

jonas51

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Hello so I bought a 99 jimmy a few years back the chk engine came on literally the day after I bought it and have been trying to get it off ever since pretty much everything has been done to get it off and it just wont go off no matter what .the list of things done would take forever to list here but the code reader just keeps coming up bank 1 sensor 1 I have changed all . The light just comes right back in after reset!! Its making me crazy !! Help . Thanks in advance
 
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