P0136 – O2 Sensor Circuit (Bank 1 Sensor 2)

Description

The ECM detects a fault in the downstream O2 sensor on Bank 1.

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Symptoms

  • Check engine light
  • Poor fuel economy

Causes

  • Faulty O2 sensor
  • Exhaust leaks
  • Wiring issues

Diagnosis

  • Monitor O2 data
  • Inspect exhaust
  • Check wiring

Repair

  • Replace O2 sensor
  • Fix leaks