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P0156 — O2 Sensor Circuit (Bank 2 Sensor 2)

Downstream O2 sensor on bank 2 has a circuit problem.

Severity: MediumRepair: $80-$250Difficulty: Easy

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Common symptoms of P0156

Common causes of P0156

Repair cost & difficulty

Typical cost to fix P0156: $80-$250 · Difficulty: Easy

Pro tip: Faulty downstream sensor on bank 2 can cause false P0430.

Vehicles commonly affected

V6/V8 engines

Related trouble codes

P0157P0158P0430

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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.