O2 Sensor Reference Voltage Performance Bank 1 Sensor 1
Code P2244 indicates that the oxygen sensor (Bank 1, Sensor 1) reference voltage is out of the expected range. This sensor is located before the catalytic converter and measures air-fuel ratio. The reference voltage is typically 0.45 volts; a deviation can cause incorrect fuel trim adjustments, leading to poor engine performance and increased emissions.
01. Most Common Causes
- Faulty oxygen sensor (Bank 1, Sensor 1)
- Wiring or connector issues (corrosion, damage, loose connection)
- Exhaust leak near the sensor
- Engine vacuum leak
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify code P2244 and check for other related codes.
Step 2: Visually inspect the O2 sensor wiring and connector for damage or corrosion.
Step 3: Measure the reference voltage at the sensor connector (should be ~0.45V with engine running).
Step 4: Check for exhaust leaks upstream of the sensor.
Step 5: If all else is fine, replace the O2 sensor (Bank 1, Sensor 1).
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but it may cause poor fuel economy and increased emissions. Prolonged driving could damage the catalytic converter.
How much does it cost to fix?▼
Typically $50-$150 for a DIY sensor replacement; labor adds $50-$100 if done by a shop.