OBD2 Codes

Get detailed guides to the definition, meaning, symptoms, causes, diagnosis and how to fix OBD2 codes.

P0161 – O2 Sensor Heater Circuit

OBD trouble code P0161 usually means that there’s a sensor malfunction in bank 2 sensor 2. It’s usually accompanied by the Check Engine Light. Although it’s not a serious code, if left unattended to for an extended period it can damage the car engine.