DTC P0140: O2 Circuit No Activity Detected (Bank 1, Sensor 2)
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.
P0140 - O2 CIRCUIT NO ACTIVITY DETECTED (BANK 1, SENSOR 2)
| Description: | The powertrain control module (PCM) monitors the heated oxygen sensor (HO2S) for a lack of movement concern. If the sensor signal value is not changing from the default value, the PCM commands an oscillating air/fuel ratio attempting to detect some movement in the signal value. The test fails when the PCM is unable to detect movement in the sensor signal while the air/fuel ratio is oscillating. | ||
| Possible Causes: |
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| Diagnostic Aids: | An HO2S PID switching across 0.45 volt from 0.2 to 0.9 volts indicates a normal switching HO2S. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST DW . | ||