P0134 – O2 Sensor No Activity (Bank 1 Sensor 1)

Description

The ECM detects no activity from the upstream O2 sensor on Bank 1.

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Symptoms

  • Rough idle
  • Poor fuel economy
  • Hesitation

Causes

  • Faulty O2 sensor
  • Wiring issues
  • Exhaust leaks

Diagnosis

  • Monitor O2 data
  • Inspect wiring
  • Check exhaust

Repair

  • Replace O2 sensor
  • Repair wiring