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Where To Buy The Oxygen Sensor And Save Some $$$
Having the oxygen sensor's heater element fail is a very common problem and sooner or later, you'll need to replace one of them on your Honda Civic.
So, if you find, after testing the downstream oxygen sensor needs to be replaced, take a look at the links below. I think they'll save you some bucks:
NOTE: If you're not sure if the above downstream O2 sensor fit your particular 1.7L Honda Civic, don't worry, once you get to the site, they'll make sure the sensor is the right one, if not, they'll find you the right one.
If this info saved the day, buy me a beer!