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Getting 2 engine codes; PO134 & PO135. What do these codes mean. on 2004 Chevrolet Tahoe

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Getting 2 engine codes; PO134 & PO135. What do these codes mean. And what's the estimate cost to repair?
(2) Answers
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Codes are for the heater circuits on 2 separate oxygen sensors. Suspisious that you 2 go at same time. Could be te sensors themselves. But posssible causes are: Oxygen (O2) Sensor Wiring, Oxygen Sensors, or Powertrain Control Module (PCM)
I cannot help you with cost....need to pin down whats wrong first.u
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