So I changed out sensor 1 ,spark plugs,gas cap and the alarm for sensor 2 is still there. Will it take time for the computer to reset or could the computer have a issue
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It may eventually re-set on its own. You could try lifting the battery negative lead for a minute and re-connecting. I have had to change both my sensors. I had a code for the downstream and replaced it (2nd time). That did not clear the code. Then I replaced the upstream A/F sensor and that cleared the downstream code. Not sure what was going on, but finally that took care of the problem. Hopefully that will do the same in your case.