P0144

Q: What does OBD2 code P0144 mean?

P0144 means: O2 Sensor Circuit High Voltage Bank 1 Sensor 3. Third O2 sensor on bank 1 reads high voltage. Some vehicles have a third O2 sensor after a secondary catalytic converter.

O2 Sensor Circuit High Voltage Bank 1 Sensor 3

Third O2 sensor on bank 1 reads high voltage. Some vehicles have a third O2 sensor after a secondary catalytic converter.

SeverityMinor

CategoryEmissions

Est. Repair Cost$100–$280

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Failed third O2 sensor
›Rich exhaust passing through both converters
›Wiring fault

⚠️ Symptoms

›Check engine light
›Failed emissions test

✅ How to Fix — Step by Step

Step 1:Inspect third sensor wiring
Step 2:Check converter efficiency
Step 3:Replace sensor

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔Digital Multimeter
✔Basic Hand Tools
✔Flashlight
✔Vehicle Service Manual

Using the correct diagnostic tools helps identify the root cause of P0144 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Third O2 sensors are found on some European and larger displacement engines with multiple catalytic converters.

Repair Cost Estimate

Full Repair Estimate

$100–$280

DIY Possible?

YES

Severity

Minor

Frequently Asked Questions

What does OBD2 code P0144 mean?+

P0144 stands for O2 Sensor Circuit High Voltage Bank 1 Sensor 3. Third O2 sensor on bank 1 reads high voltage. Some vehicles have a third O2 sensor after a secondary catalytic converter.

What causes code P0144?+

Failed third O2 sensor; Rich exhaust passing through both converters; Wiring fault

How do I fix code P0144?+

Inspect third sensor wiring; Check converter efficiency; Replace sensor

How much does it cost to fix P0144?+

Estimated repair cost for P0144 is $100–$280.

Is P0144 DIY-friendly?+

Yes — P0144 is generally DIY-friendly with basic tools.