Code result
P0144
O2 Sensor Circuit High Voltage
Moderate severity
What it means
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?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Lean exhaust (vacuum leak, low fuel pressure)
highOne of the most commonly reported causes for this code — check this first.
Signal wire shorted to ground
mediumA plausible cause — test and verify before replacing parts.
O2 sensor failed
mediumA plausible cause — test and verify before replacing parts.
Related help
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