OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P0144?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyLean exhaust (vacuum leak, low fuel pressure)
- PossibleSignal wire shorted to ground
- PossibleO2 sensor failed
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor B1s3, Oxygen Sensor Wiring
Related codes
- P0157O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
- P0158O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
- P0164O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
- P0141O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
- P0142O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
- P0143O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
- P0145O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
- P0146O2 Sensor Circuit No Activity / Slow Response (Bank 1 Sensor 3)
- P0147O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.