Chevrolet truck, codes for all 4 O2 sensors came on simultaneously?

1998 CHEVROLET SILVERADO
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BRDSMITH15
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Had CEL with codes for all 4 O2 sensors come on simultaneously?
Mar 2, 2012 at 6:05 AM
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FIXITMR
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anything else seem funny?
Mar 2, 2012 at 7:18 AM
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FIXITMR
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did you clear and see if they come back?
Mar 2, 2012 at 7:37 AM
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BRDSMITH15
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The CEL turned off on its on today, still wonder y it would simultaneously show codes for all 4 02s at one time? Never noticed any irregualar performance.
Mar 2, 2012 at 11:51 PM