P0144: O2 Sensor Circuit High Voltage (Bank 1, Sensor 3)

P0144 means the third oxygen sensor on Bank 1 (typically placed after a second catalyst stage or in commercial vehicle aftertreatment systems) is reporting a voltage that stays too high for too long, above roughly 1.0V. This code applies primarily to specific engine configurations with three sensors per bank, common on diesel commercial vehicles and some V6/V8 multi-converter setups.

P0144 è un codice diagnostico di guasto relativo a emissioni, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0144 e accende la spia motore.

Se il tuo veicolo ha attivato P0144, potresti notare uno o più di questi sintomi:

• Check engine light illuminated
• Increased fuel consumption in some cases
• Possible failed emissions test
• Usually no noticeable change in driveability
• May appear alongside P0420 or aftertreatment-system codes

Ecco le cause più comuni di P0144, ordinate in base alla probabilità che siano la causa del problema:

In genere sì, per brevi tragitti. Safe to drive short term. Sensor 3 is a monitoring sensor in extended aftertreatment systems and does not drive fuel mixture, but persistent high voltage may signal a genuine rich condition or contamination that should be diagnosed within a few weeks.

Segui questi passaggi per individuare la causa principale di P0144:

1. Confirm the vehicle's exhaust layout. Sensor 3 is rare and only present on multi-catalyst configurations or diesel commercials with extended aftertreatment
2. Read freeze frame data and look for companion codes (P0172, P0175, P0420) that indicate a real rich condition or catalyst issue
3. Check long-term fuel trims. Significantly negative LTFT (under -10%) suggests a genuine rich condition rather than a faulty sensor
4. Inspect the Sensor 3 signal wire for shorts to voltage, especially near heat shields and chassis power runs
5. Substitute a known-good sensor. If high voltage persists, the issue is upstream (fuel mixture or wiring)

I costi di riparazione di P0144 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

P0144 si comporta in modo diverso a seconda del tuo veicolo. Seleziona la tua auto qui sotto per cause specifiche del modello, problemi noti e stime dei costi adeguate:

Questi codici compaiono spesso insieme a P0144 o indicano problemi correlati: