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2013 SUBARU BRZ
2.0L H4•RWD•MANUAL•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor487Torque5205Fluid8DTC1108Battery1Maintenance0Recalls2
P0030low severityPowertrain

HO2S Heater Control Circuit Bank 1 Sensor 1

on 2013 Subaru BRZ 2.0L H4 · RWD

What this code means

The PCM detected a malfunction in the heater circuit of the upstream heated oxygen sensor (Bank 1, Sensor 1).

Symptoms

  • Check Engine Light
  • Poor fuel economy
  • Longer warmup emissions
  • Failed emissions test

Common causes

  • Faulty O2 sensor heater
  • Blown fuse
  • Wiring issue
  • PCM heater driver failure

Diagnostic steps

  1. Check O2 sensor heater fuse
  2. Test heater circuit resistance (should be 2-30 ohms)
  3. Inspect wiring to sensor
  4. Check PCM heater control output

Repair notes

Replace O2 sensor if heater resistance is out of spec. Check fuse and wiring first.

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