P0145: O2 Sensor Circuit Slow Response (Bank 1, Sensor 3)

P0145 means the third oxygen sensor on Bank 1 (typically placed after a second catalyst stage or in commercial vehicle aftertreatment systems) is not switching between rich and lean readings quickly enough during the ECU's monitor test. 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.

P0145 è un codice diagnostico di guasto relativo a emissioni, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0145 e accende la spia motore.

Se il tuo veicolo ha attivato P0145, potresti notare uno o più di questi sintomi:

• Check engine light illuminated
• Slight reduction in fuel economy
• Possible failed emissions test
• No noticeable driveability symptoms
• May appear with P0420 if the aftertreatment is also degrading

Ecco le cause più comuni di P0145, ordinate in base alla probabilità che siano la causa del problema:

In genere sì, per brevi tragitti. Safe to drive short term. A slow Sensor 3 distorts the aftertreatment monitoring strategy, so a developing catalyst or SCR problem may be masked. Plan a repair within a few weeks to keep emissions diagnostics working properly.

Segui questi passaggi per individuare la causa principale di P0145:

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 (P0420, P0143) that suggest a broader aftertreatment issue
3. Inspect the exhaust system around Sensor 3 for leaks that could distort the gas sample
4. Use a scan tool to graph Sensor 3 voltage during steady cruise and deceleration fuel cut. A healthy sensor reacts within roughly 100 ms to a lean spike when fuel is cut
5. Substitute a known-good sensor. Response time is the only definitive test, so if the new sensor responds correctly, the original was aged out

I costi di riparazione di P0145 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

P0145 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 P0145 o indicano problemi correlati: