Re: What does the error code PO 138 really mean?
Travis,
It is a little confusing because in some code charts it reads: P0138 HO2S Circuit High Voltage Bank 1 Sensor 2, and the Sensor 2 means it's the downstream 02 sensor. I went with the explanation from PT Do-It-Yourself.net site because it was put together by mechanics and people that supposedly know what they are doing.
Me, I replaced both at 95,000 miles before either one gave me problems. I definitely believe in preventive maintenance.
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