99 times out of 100, if the O2 sensor has a heater circuit code, the sensor itself is the problem. The other 1 percent is usually wiring harness problems. Don't waste your time or money on an aftermarket sensor. I don't know exactly why, but every time I tried one, the car would come back in with "Oxygen/ Air Fuel Sensor Lean" codes. Get the sensor from the dealer.
P0134....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135....O2 Sensor Heater Circuit (Bank 1 Sensor 1) heater in the O2 sensor has packed up first sensor before the cat
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