P0424: Heated Catalyst Temperature Below Threshold (Bank 1)

P0424 means the temperature of the heated catalyst on Bank 1 (an electrically heated e-cat used on newer Euro 6 and 6d vehicles) is not rising fast enough or not reaching the expected level during cold start. Unlike P0423 which is an efficiency code, P0424 is specifically about the heater not delivering enough thermal energy.

P0424 è un codice diagnostico di guasto relativo a emissioni, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0424 e accende la spia motore.

Se il tuo veicolo ha attivato P0424, potresti notare uno o più di questi sintomi:

• Check engine light illuminated, typically within the first minute of cold-start driving
• Long warm-up time before the engine reaches stable operating idle
• Elevated cold-start emissions visible as white-grey vapour for longer than usual
• Slight reduction in fuel economy on short trips
• Failed emissions or periodic technical inspection

Ecco le cause più comuni di P0424, ordinate in base alla probabilità che siano la causa del problema:

In genere sì, per brevi tragitti. Safe to drive in the short term. The heated catalyst on Bank 1 is not reaching its target light-off temperature within the expected time, so cold-start emissions are elevated and emissions or periodic technical inspection will fail. If the e-cat heater shorted out, related wiring or fuse damage should be ruled out promptly.

Segui questi passaggi per individuare la causa principale di P0424:

1. Read freeze frame and confirm the code set during the first 60 to 90 seconds of cold start, which is the typical fault window for P0424
2. Check for any heater-circuit-specific codes (manufacturer-specific) and inspect the relevant fuse, often shared with the e-cat heater relay
3. Measure heater element resistance per OEM spec (typically 0.3 to 2.0 ohms). Open circuit means the element has failed
4. Inspect the wiring harness from the heater relay to the catalyst connector for chafing, water ingress, or melted insulation near the exhaust
5. Use a clamp meter to verify current draw at start (commonly 30 to 80 A briefly). Insufficient current points to a relay, wiring, or 48V supply fault

I costi di riparazione di P0424 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

P0424 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 P0424 o indicano problemi correlati: