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PROBLEM SOLVED I ended up replacing both O2 sensors and the problem was remedied. Even though I did not get an OBD code for the downstream...
Thank you for your input. On a whim, I went out and purchased a downstream O2 sensor and installed it this morning. The original trouble code I...
So I got a P0031 code for my 2012 Prius C. The upstream O2 sensor. Easy enough. I bought an new one and installed it. I did an ECU reset,...