O2 Sensor Heater Resistance Bank 2 Sensor 3
The P0061 code indicates a problem with the heater circuit of the oxygen sensor located in Bank 2, Sensor 3 (downstream of the catalytic converter on the engine bank opposite cylinder #1). The heater element resistance is out of the expected range, which can prevent the sensor from reaching operating temperature quickly, affecting fuel trim and emissions monitoring.
01. Most Common Causes
- Faulty oxygen sensor (Bank 2, Sensor 3)
- Open or shorted heater circuit wiring
- Blown fuse or relay for O2 sensor heater
- Corroded or damaged connector
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible poor fuel economy
- Rough idle or hesitation (less common)
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the O2 sensor connector and wiring for damage or corrosion.
Step 3: Measure heater resistance at the sensor connector (typically 2-10 ohms). Compare to specs.
Step 4: Check for battery voltage and ground at the heater circuit with key on engine off.
Step 5: If voltage and ground are present and resistance is out of range, replace the sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but the vehicle may fail emissions and fuel economy may suffer. It's best to repair soon.
How much does it cost to fix?▼
Typically $50-$150 for a DIY sensor replacement; labor adds $50-$100 if done by a shop.