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2002 VOLVO S80
2.9L I6•AWD•AUTOMATIC•gas•B6294S
5 active safety recalls on this vehicle — view recalls
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Repairs0Labor1005Torque6617Fluid14DTC1718Battery2Maintenance0Recalls5
P0135low severityPowertrain

O2 Sensor Heater Circuit Bank 1 Sensor 1

on 2002 Volvo S80 2.9L I6 · AWD

What this code means

The PCM detected a malfunction in the heater element of the upstream O2 sensor on Bank 1.

Symptoms

  • Check Engine Light
  • Extended warmup emissions
  • Failed emissions test

Common causes

  • Faulty O2 sensor heater element
  • Blown fuse
  • Wiring damage
  • PCM heater driver failure

Diagnostic steps

  1. Check O2 heater fuse
  2. Test heater resistance (typically 2-30 ohms)
  3. Inspect wiring
  4. Check PCM heater relay output

Repair notes

Replace O2 sensor if heater resistance is open or out of spec.

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