2010 Cobalt LT Check Engine Light & Power Reduction: P0107, P0138, C342D Fault Codes Explained
I own a 2010 Chevrolet Cobalt LT and am experiencing intermittent check engine light activation accompanied by 'Engine Power Reduced' warnings. During these episodes, the vehicle loses acceleration capability, backfires, and occasionally stalls. OBD-II scan reveals three fault codes: P0107, P0138, and C342D. I'm seeking accurate diagnosis—what could be causing this combination of issues in my 2010 Cobalt LT? Any insights or troubleshooting steps would be greatly appreciated.
Is the vehicle stock configuration? The C342D code is less commonly referenced—please confirm it's accurately read and verified. P0107 typically indicates a MAP (Manifold Absolute Pressure) sensor fault, as detailed at https://www.obd-codes.com/p0107. P0138 points to an oxygen (O2) sensor issue, specifically the upstream sensor on bank 1, sensor 2, as outlined in https://www.obd-codes.com/p0138. These codes may point to fuel delivery or air intake system problems requiring further inspection.