P0144
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
The ECU detects an abnormally low voltage from the third O2 sensor on bank 1. Indicates persistently lean exhaust, an open sensor or wiring shorted to ground.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
Ordered by how often each turns out to be the cause.
- Lean exhaust (vacuum leak, low fuel pressure)Common
- Signal wire shorted to groundPossible
- O2 sensor failedPossible
Parts involved
- Oxygen Sensor B1s3
- Oxygen Sensor Wiring
P0144 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.