P0061
HO2S Heater Resistance Bank 2 Sensor 3
Oxygen sensor heater
Generic OBD-II
Medium
What it means
P0061 means the ECM measured the heater resistance of the Bank 2, Sensor 3 oxygen sensor and found it outside the expected range. That heater brings the deep-downstream sensor up to temperature so it can read exhaust oxygen accurately. The car drives normally, but the out-of-spec reading trips the check-engine light and prevents the emissions readiness monitor from completing.
Medium
Can I keep driving? Yes — the car drives normally, but the affected sensor's heater is out of spec, so expect a check-engine light and a likely emissions-test failure until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Failed or incomplete emissions test (readiness monitor won't set)
- Slightly reduced fuel efficiency
- Usually no change in how the car drives or feels
Common causes
Most likely first
- Oxygen sensor heater element out of spec / aged (Bank 2, Sensor 3)Likely
- High resistance from corroded or loose connector pinsCommon
- Damaged or chafed heater wiringCommon
- Faulty ECM/PCM heater monitor (rare — check the sensor and wiring first)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the code is current.
- Inspect the Bank 2 Sensor 3 connector for corrosion or spread pins, which raise circuit resistance.
- Measure the heater element resistance and compare to spec — an out-of-range value confirms the sensor.
- Check wiring continuity from the sensor connector back toward the ECM.
- Replace the oxygen sensor if its heater resistance is out of spec. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0061?+
Yes. It's a heater-monitor fault on a downstream sensor, not a running problem — the engine drives normally. Fix it before an emissions test since the monitor won't complete.
Can I just clear P0061?+
It clears but comes back once the ECM re-tests the heater. Repairing the connector or replacing the sensor is what keeps it off.
Related codes
Often seen with P0061
Read & clear P0061 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX