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2000 MAZDA 626

2.5L V6•FWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor563Torque3486Fluid6DTC674Battery0Maintenance0Recalls2
P0139low severityPowertrain

O2 Sensor Circuit Slow Response Bank 1 Sensor 2

on 2000 Mazda 626 2.5L V6 · FWD

What this code means

The downstream O2 sensor on Bank 1 is responding too slowly.

Symptoms

  • Check Engine Light
  • Failed emissions

Common causes

  • Aging sensor
  • Contaminated sensor
  • Catalyst issue

Diagnostic steps

  1. Monitor sensor response
  2. Check catalyst efficiency

Repair notes

Replace downstream O2 sensor.

Other Powertrain codes on this vehicle

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