Check Engine Code
P0161
O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 2)
Severity: low
DIY difficulty: 2/5
Typical cost: $40–$300
What P0161 means
Bank 2 twin of P0141. Downstream sensor heater circuit failure.
Symptoms
- CEL
- Emissions readiness slow
Likely causes (most common first)
- Failed heater
- Fuse
- Wiring near hot exhaust
Can I keep driving?
Low — mostly emissions/economy
Typical repair cost
DIY fixes can start near $40 (parts only). Shop repairs for P0161 typically run up to $300 depending on the underlying cause and vehicle. Start with the most common cause — Failed heater — before throwing parts at it.
Recommended parts & tools for P0161
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