OBD-II Error Code P0144: O2 Sensor High Voltage B1S3 – How to Fix It

Q: What does Bank 1 Sensor 3 mean?

Bank 1 refers to the side of the engine with cylinder #1. Sensor 3 is the second downstream O2 sensor (after the catalytic converter), typically used to monitor converter efficiency.

Q: Can a bad catalytic converter cause P0144?

Yes, a failing catalytic converter can cause abnormal O2 sensor readings, but the most common cause is a faulty sensor or wiring issue. Diagnose the sensor first.

Q: Is it safe to drive with P0144?

You can drive short distances, but it may cause reduced fuel economy and potential catalytic converter damage over time. It's best to fix it promptly.

Q: How do I know which O2 sensor is Bank 1 Sensor 3?

Consult your vehicle's repair manual. Typically, Sensor 3 is located after the catalytic converter on the bank 1 side of the engine. Count sensors from the engine: Sensor 1 is upstream, Sensor 2 is first downstream, Sensor 3 is second downstream (if present).

Q: Will disconnecting the battery clear P0144?

Disconnecting the battery may temporarily clear the code, but it will return if the underlying issue isn't fixed. Use an OBD2 scanner to clear codes properly.

Abstract

Error code P0144 indicates that the oxygen (O2) sensor on Bank 1, Sensor 3 is reporting a voltage higher than expected (typically above 1.0V). This sensor monitors the catalytic converter's efficiency. A high voltage reading can be caused by a faulty sensor, exhaust leaks, fuel contamination, or wiring issues.