GMC Sonoma P0140: O2 Sensor → No Activity Detected B1S2
P0140 is a generic OBDII trouble code. It has the same meaning for any vehicle with OBDII, including the GMC Sonoma. It means that the PCM/ECM is not detecting any activity from the sensor. It doesn’t mean that the O2 sensor isn’t getting power, but that the voltage isn’t changing, which is the “no activity”. … Read more