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Will (not verified)    December 27, 2020 - 3:43PM

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Hi, I am the new owner of a 2005 Prius with 216k miles. The check engine light was illuminated periodically, but is now always on. I checked the diagnostic codes using an ODII scanner.
The codes are:
-P0138/$07E8 (description: "O2 Sensor Circuit High Voltage Bank 1 Sensor 2)
-P0327/$07E8 (description: "Knock Sensor 1 Circuit Low Bank 1 or Single Sensor)
-P0606/$07E8 (description: ECM/PCM Processor).
A Toyota technician recommended replacing the Bank 1 Sensor 2 oxygen sensor for $400, but at the time I was not eager to shell out that money for a solution that may not work, in order to remedy a problem that does not seem to be affecting my car's performance. So.. the main question is, "What now?" What is the cause of these trouble codes? How can I fix it?

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