How is fault code P2002 fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. First, take the car for a 30-40 minute motorway run at sustained 70 mph. This is the 'Italian tune-up' for diesels, it gives the DPF a chance to regenerate properly. A surprising proportion of P2002s clear themselves after one good run 2. Read live data on differential pressure and DPF temperatures during the run. Healthy regen sees temps rise to around 600°C briefly 3. Check the differential pressure sensor and its hoses, blocked or split sample hoses give false readings 4. If repeated long runs and a forced regen don't clear the code, the DPF substrate is likely compromised 5. Address any other stored codes (boost, EGR, fuel pressure) before condemning the DPF, those upstream issues cause DPF blockage

Diesel Particulate Filter Efficiency Below Threshold Bank 1

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. First, take the car for a 30-40 minute motorway run at sustained 70 mph. This is the 'Italian tune-up' for diesels, it gives the DPF a chance to regenerate properly. A surprising proportion of P2002s clear themselves after one good run 2.

PPowertrain
2Generic code
0Fuel / Air
02Sequence number

What does it mean?

P2002 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: DPF Efficiency Below Threshold (Bank 1) . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

Symptoms

Likely causes

How to fix it

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.