P0175: System Too Rich (Bank 2)

P0175 means the air-fuel mixture on Bank 2 is too rich and the ECU cannot remove enough fuel to bring it back to the 14.7:1 stoichiometric target. Because the code is bank-specific, the cause is usually something local to Bank 2 (a leaking injector on that side, a degraded sensor, or fuel pressure imbalances) rather than a whole-engine issue.

P0175 è un codice diagnostico di guasto relativo a sistema di alimentazione, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0175 e accende la spia motore.

Se il tuo veicolo ha attivato P0175, potresti notare uno o più di questi sintomi:

• Check engine light on
• Reduced fuel economy
• Strong fuel smell from the exhaust
• Black soot at the tailpipe outlets, sometimes only on one side
• Rough idle and possible cylinder-bank misfires

Ecco le cause più comuni di P0175, ordinate in base alla probabilità che siano la causa del problema:

In genere sì, per brevi tragitti. Short-term driving is safe, but a rich-running bank wastes fuel, fouls plugs on that side, and gradually damages the catalytic converter on Bank 2. Fix within a couple of weeks to avoid catalyst replacement costs.

Segui questi passaggi per individuare la causa principale di P0175:

1. Read live data: confirm Bank 2 long-term fuel trim is negative beyond -20% while Bank 1 stays within normal range
2. Pull Bank 2 spark plugs and inspect for black sooty deposits. Compare to Bank 1 plugs; a clear visual difference confirms the bank-specific richness
3. Swap the upstream lambda sensors between Bank 1 and Bank 2. If the rich condition follows the sensor, replace it
4. Measure fuel pressure with a gauge and compare to spec at idle and under load. High pressure can over-fuel both banks but sometimes shows up more on the bank with already weak injectors
5. Perform an injector balance test or have injectors flow-tested off the engine. A single leaking injector on Bank 2 explains the code on a V6 or V8

I costi di riparazione di P0175 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

P0175 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 P0175 o indicano problemi correlati: