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P0158 code indicated a voltage high problem with the Bank 2 Sensor 2 (oxygen sensor, left (front) bank, after converter). Changed the sensor, but the problem continued, so the sensor was actually doing its job. Fortunately, I had bought the new Denso 234-4261 oxygen sensor on Amazon for only $49. I then changed the air-fuel sensor Denso 234-9049 (bank 2 sensor 1, before converter) from Amazon $89. This cured the problem.

Hopefully this information will save someone having this problem some time and money.
 
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