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A little guy in your engine computer counts the number of O2 sensor switches per minute, if the count is low or none at all, sets an O2 sensor code. Typically not the culprit but the victim, misfire or even water in the fuel can also be the culprit.

Would check your spark plugs first, gap should be at 28 miles and the center electrode insulators have to be white. Water in the tank typically follows a fill up.

Second O2 sensor follows the first, if the first ain't working the secondary one can't work either.
 
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