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Front o2 sensor problems w/ mutliple cels

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About a month ago i got a cel (p0030) for the heater element in the front o2 sensor. Looked around on these boards and talked with a few friends at the dealer and decided to replace the sensor. Its been a month now with no cel and out of the blue it came back. Same code, same problem. Convinced the dealer to replace the sensor under parts warrenty and swapped it our again. Ran good for another 100 mi and now I'm getting three codes (p0030, 0031, and 0134). Have gone through and made sure that all the connections are tight n clean. I need some ideas about what could be causing this. I have 1000mi to drive before I'll have a chance to get this looked at, so any help is appreciated.
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