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Q: engine codes p0136 and p0138.too much volts heat side of o2 sensor? on 2000 Honda Civic

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
light went on, cleared code went back on next day,got above codes.took to shop said o2 sensor1 gettn too many volts.light when back off stayd off for 10 days.back 2 shop tested wiring with flowchaart but car kept gong back 2 normal range.suspect main computer does this sound right way 2 diagnose this or nd to go to dealer b4 shelln out computer money?
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