P0140 Code - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2

What Does P0140 Mean?

The oxygen sensor (O2 sensor) that is located on bank 1, sensor 2 relies on a 0.45V voltage reference generated by the engine control module (ECM). When this voltage is exceeded or not met, the O2 sensor misreads the amount of oxygen in the exhaust. This results in a sensor malfunction or failure. The readouts from this sensor are used in vehicle emission tests; a faulty test can cause the vehicle to fail these tests. While the issue in itself is minor, it may be indicative of a more serious problem within the fueling or exhaust system. It may also lead to more frequent or serious issues involving the engine.
While a sensor failure may sound major, it is in fact a natural part of the vehicle life cycle; sensors will inevitably fail and need to be replaced as the vehicle continues to be operated over time.

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What are the common causes of P0140 ?

Possible causes include a faulty oxygen sensor, faulty electrical connector at the oxygen sensor, faulty or shorted wiring in the oxygen sensor circuit, a blown fuse for the oxygen sensor (if applicable), low or excessive fuel pressure, a vacuum leak on the engine, excessive exhaust leaks, or a faulty PCM. PCM failure is rare.

What are the symptoms of P0140 ?

• Check Engine Light will illuminate
• In many cases, no abnormal symptoms may be noticed
• In some cases, the vehicle will fail an Emissions Test
• In many cases, the NOx emissions will be elevated

How do you troubleshoot P0140 ?

The valves of each cylinder are kept closed using a pair of arms that replace the conventional engine's roller-type rocker arm. P0140 code one of these arms follows the cam profile while the second arm connects to the valves. During normal engine operation the two arms are joined by a locking pin.

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