P0161
O2 Sensor Heater Circuit Bank 2 Sensor 2
P0161 is an OBD-II diagnostic trouble code meaning: O2 Sensor Heater Circuit Bank 2 Sensor 2. Common causes: malfunction of the oxygen sensor (lambda probe), open or short circuit in the heater circuit. Estimated repair cost: $56–167.
Symptoms
- Increased fuel consumption
- Unstable engine operation at idle
- Check Engine Light Is On
- Increased level of harmful emissions
Causes
- Malfunction of the oxygen sensor (lambda probe)
- Open or short circuit in the heater circuit
- Wiring harness damage
- Faulty relay or fuse
- Problems with the ECU
How to Fix
- Check the resistance of the sensor heater (should be within 5-20 Ohms)
- Check the integrity of wiring and connectors
- Check the voltage in the heater circuit (usually 12 V)
- Replace the oxygen sensor if necessary
- Check and replace fuse or relay if necessary
Related codes
Error P0161 by Vehicle Brand
FAQ
What does the P0161 code mean?
P0161 is an OBD-II diagnostic trouble code that indicates: O2 Sensor Heater Circuit Bank 2 Sensor 2
What causes a P0161 error code?
The most common causes of P0161 include: Malfunction of the oxygen sensor (lambda probe); Open or short circuit in the heater circuit; Wiring harness damage; Faulty relay or fuse.
How do I fix a P0161 diagnostic trouble code?
To fix P0161: Check the resistance of the sensor heater (should be within 5-20 Ohms). Check the integrity of wiring and connectors. Check the voltage in the heater circuit (usually 12 V). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0161?
Limited driving only, diagnose soon
How much does it cost to fix P0161?
The estimated repair cost for P0161 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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