P0140 Fault Code

P0140 OBD-II Trouble Code Short Description

O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)

What does trouble code P0140 mean?

The P0140 code indicates that the engine control module (ECM) has detected a problem with the oxygen sensor circuit for Bank 2 Sensor 2. This sensor is responsible for monitoring the oxygen levels in the exhaust and is vital for maintaining optimal air-fuel ratios. A No Activity Detected fault suggests that the ECM is not receiving signals from the sensor as expected.

Symptoms

What are the symptoms of the P0140 code?

  • Illuminated check engine light
  • Decreased fuel efficiency due to improper air-fuel mixture
  • Rough engine idle
  • Increased emissions during inspection
  • Failed emissions test

Causes

What causes the P0140 code?

  • Damaged or corroded wiring in the oxygen sensor circuit
  • Faulty oxygen sensor itself
  • Poor connection at the sensor or the ECM
  • Issues with the exhaust system, such as leaks
  • Malfunctioning ECM

Possible Solutions

How to fix P0140?

  • Inspect and repair wiring and connectors in the oxygen sensor circuit
  • Replace the faulty oxygen sensor
  • Check for exhaust leaks and repair if found
  • Clear the fault code and test drive the vehicle to see if the issue persists