P2002: Diesel Particulate Filter Efficiency Below Threshold (Bank 1)

P2002 means your diesel particulate filter is clogged with soot beyond the acceptable level and cannot clean itself through normal regeneration. The DPF traps harmful soot particles from diesel exhaust, but when it becomes overloaded, engine performance drops and backpressure builds to dangerous levels.

P2002 è un codice diagnostico di guasto relativo a emissioni, classificato con gravità high. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P2002 e accende la spia motore.

Se il tuo veicolo ha attivato P2002, potresti notare uno o più di questi sintomi:

• DPF warning light illuminated on dashboard
• Check engine light on
• Noticeable loss of power and acceleration
• Increased fuel consumption
• Excessive black or white smoke from exhaust
• Vehicle entering limp mode
• Strong exhaust smell in or around the cabin
• Engine fan running constantly at high speed

Ecco le cause più comuni di P2002, ordinate in base alla probabilità che siano la causa del problema:

No, risolvi subito il problema. A blocked DPF can cause excessive exhaust backpressure that damages the turbocharger and engine. Continued driving without a successful regeneration may lead to a forced engine derate or complete DPF failure requiring expensive replacement.

Segui questi passaggi per individuare la causa principale di P2002:

1. Read freeze frame data and check the DPF soot loading percentage with a diagnostic scanner. Values above 80-85% indicate a severely blocked filter. Also note the km since last successful regeneration.
2. Check the DPF differential pressure sensor readings with the engine running. Compare upstream versus downstream exhaust pressure. Excessively high differential pressure confirms a physical blockage, while normal pressure with a P2002 code suggests a sensor fault.
3. Inspect the DPF temperature sensors (upstream and downstream). The upstream sensor should read 400-600 degrees Celsius during active regeneration. If temperatures are too low, the regeneration process cannot burn off soot effectively.
4. Check for additional codes related to the EGR system, turbocharger, or fuel injectors. A malfunctioning EGR valve or leaking injector produces excess soot that overloads the DPF faster than it can regenerate.
5. Attempt a forced (stationary) regeneration using a dealer-level diagnostic tool. If the regeneration completes and pressure drops to normal, the DPF is still functional but the driving pattern was preventing passive regeneration. If it fails, the DPF may need professional chemical cleaning or replacement.
6. Check the engine oil specification. Diesel engines with DPFs require low-SAPS oil (typically ACEA C2 or C3). Standard oil produces ash that permanently blocks DPF cells and cannot be burned off during regeneration.

I costi di riparazione di P2002 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

P2002 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 P2002 o indicano problemi correlati: