P0137 – O2 Sensor Low Voltage (Bank 1 Sensor 2)

Description

The ECM detects a low voltage signal from the downstream O2 sensor.

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Symptoms

  • Poor fuel economy
  • Check engine light

Causes

  • Exhaust leaks
  • Faulty O2 sensor
  • Wiring issues

Diagnosis

  • Monitor O2 data
  • Inspect exhaust
  • Check wiring

Repair

  • Replace O2 sensor
  • Fix leaks