Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 44
Possible causes
- Lean exhaust (vacuum leak, low fuel pressure) high
- Signal wire shorted to ground medium
- O2 sensor failed medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 80–350 €
- Estimated time: 0.3–1.5 h
- Component: oxygen sensor b1s3
- Component: oxygen sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012