P0133 – O2 Sensor Slow Response (Bank 1 Sensor 1)

Description

The ECM detects a slow response from the upstream O2 sensor on Bank 1.

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Symptoms

  • Hesitation
  • Poor acceleration
  • High fuel trims

Causes

  • Aging O2 sensor
  • Exhaust leaks
  • Fuel issues

Diagnosis

  • Monitor O2 switching
  • Inspect exhaust
  • Check fuel trims

Repair

  • Replace O2 sensor
  • Fix leaks