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2005 VOLVO S80
2.9L I6•AWD•AUTOMATIC•gas•B6294S
6 active safety recalls on this vehicle — view recalls
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Repairs0Labor1007Torque6617Fluid17DTC1930Battery2Maintenance0Recalls6
P0138moderate severityPowertrain

O2 Sensor Circuit High Voltage Bank 1 Sensor 2

on 2005 Volvo S80 2.9L I6 · AWD

What this code means

The downstream O2 sensor on Bank 1 is reading high voltage consistently.

Symptoms

  • Check Engine Light
  • Failed emissions
  • May indicate catalyst failure

Common causes

  • Faulty sensor
  • Catalytic converter failure
  • Rich running condition

Diagnostic steps

  1. Test sensor voltage
  2. Check catalyst efficiency
  3. Monitor upstream vs downstream O2 patterns

Repair notes

Replace sensor. If catalyst failed, replace catalytic converter.

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