P0030 HO2S Heater Control Circuit (Bank 1 Sensor 1)

Powertrain Severity: Low Generic OBD-II

The engine computer detects a fault in the heater control circuit of the upstream oxygen sensor on bank 1.

Common causes

  • Faulty sensor heater
  • Open or shorted control wire
  • Fuse or relay fault

Symptoms

  • Check engine light

What to check

  1. Check heater power and control
  2. Measure heater resistance
  3. Inspect wiring

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0030, follow the service information for that make and model.

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