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 est un code defaut lie a emissions, classe en gravite moderate. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P0144 et allume le voyant moteur.

Si ton vehicule a declenche P0144, tu peux remarquer un ou plusieurs de ces symptomes :

• 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

Voici les causes les plus courantes de P0144, classees selon la probabilite qu'elles soient en cause :

En general oui, pour des trajets courts. 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.

Suis ces etapes pour identifier la cause profonde de 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)

Les couts de reparation de P0144 varient selon la cause profonde et ton vehicule. Voici des estimations courantes :

P0144 se comporte differemment selon ton vehicule. Selectionne ta voiture ci-dessous pour des causes propres au modele, les problemes connus et des estimations de couts ajustees :

Ces codes apparaissent souvent avec P0144 ou indiquent des problemes connexes :