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P0138 Diagnostic Trouble Code Discussion for January 2024

Heated Oxygen Sensor (Bank 1 Sensor 2) Circuit High Voltage

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Trouble Ticket Help Requests for DTC P0138
Help Request Posted
2015 GMC Terrain SLE 2.4L Negative Fuel Trims VIN: 2GKALMEK9F
P0138: HO2S Delayed Response Rich to Lean Sensor 2. Test Failed. Vehicle runs fine however the fuel trims are crazy negative. Swapped MAF with known good. Swapped Cam Solenoids and throttle body with known good. (I own my own 2015 Terrain)
January 05, 2024