If it is the sensor, then search on google for cleaning the sensor.
Family Handyman or Mechanics Illustrated did a story on how to clean the sensor,
because some unscrupulous mechanix where charge for a new one with installation,
when in fact it just needed a good cleaning.
It is a piece of wire tha gets a shelac coating on it and when the coating gets too think,
the electronics think it to be bad.
It will affect your milage, if I recall from the article.
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  Bottom's up!!!
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