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P0043 — O2 Sensor Heater Control Circuit Low (Bank 1 Sensor 3)

O2 Sensor Heater Control Circuit Low (Bank 1 Sensor 3). Standard OBD2 diagnostic trouble code.

Severity: MediumRepair: $50-$500Difficulty: Medium

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Common symptoms of P0043

Common causes of P0043

Repair cost & difficulty

Typical cost to fix P0043: $50-$500 · Difficulty: Medium

Pro tip: Diagnose with a full-system scan tool like ScanFixAI for accurate root cause analysis.

Vehicles commonly affected

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Related trouble codes

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ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.