Code P0161
O2 Sensor Heater Circuit Bank 2 Sensor 2
Plain English Meaning:Rear oxygen sensor heater malfunction
Green: Safe to Drive
Low urgency
P0161 Symptoms
- •Check engine light emissions fail
Most Common Causes of P0161
P0161 Repair Playbook
Required Mechanic Tests
A qualified shop should perform these tests before replacing any parts to ensure they aren't guessing:
Test heater circuit
Typical Fix Paths & Estimated Costs
Replace sensor $100–$300
Parts for P0161 Repair
Common replacement parts for emissions codes. (Paid links)
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