P2628 – O2 Sensor Pumping Current Trim Circuit Open

Description

The ECM detects an open O2 sensor pumping current trim circuit.

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Symptoms

  • Poor fuel economy
  • Rough idle
  • Check engine light

Causes

  • Open wiring
  • Faulty sensor
  • ECM fault

Diagnosis

  • Inspect wiring
  • Test sensor
  • Check ECM

Repair

  • Repair wiring
  • Replace sensor

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