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P1131 — Lack of O2 Sensor Switch — Lean (Bank 1)

Ford-specific: Upstream O2 on bank 1 indicating persistent lean condition.

Severity: MediumRepair: $50-$400Difficulty: Medium

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Common symptoms of P1131

Common causes of P1131

Repair cost & difficulty

Typical cost to fix P1131: $50-$400 · Difficulty: Medium

Pro tip: Ford-specific lean indicator. Diagnose like P0171.

Vehicles commonly affected

Ford

Related trouble codes

P0171P0131P1151

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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.