P0140 – O2 Sensor No Activity (Bank 1 Sensor 2)

Description

The ECM detects no activity from the downstream O2 sensor.

Need More Than Just the Fault Code?

A diagnostic scanner with live data, freeze-frame information and the right system access can help you investigate the actual cause before replacing parts.

Compare Diagnostic Scanners

Symptoms

  • Check engine light
  • Poor fuel economy

Causes

  • Faulty O2 sensor
  • Wiring issues

Diagnosis

  • Monitor O2 data
  • Inspect wiring

Repair

  • Replace O2 sensor
  • Repair wiring