P2002 on Ford: How to Diagnose & Fix
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
1 Ford model · 1 documented issue · $400-$2,500 repair
P2002 on Ford by model: symptoms, diagnosis and fix
Diesel Fiestas frequently suffer diesel particulate filter (DPF) blockage and incomplete/failed regeneration, especially on cars used mainly for short, low-speed journeys that never reach regeneration temperature. Soot accumulates, the DPF warning light appears, and the car may enter limp mode or dump excess fuel into the oil during failed active regens (raising oil level and diluting it). Underlying triggers are often other faults — a leaking/faulty injector, stuck EGR, blocked intake, or failed DPF differential-pressure/EGT sensor — so the blocked DPF is frequently a symptom rather than the root cause.
Common Symptoms
- DPF / exhaust warning light
- Limp mode / reduced power
- Frequent regeneration attempts
- Rising engine oil level (fuel dilution)
- Excess smoke or smell
- Poor fuel economy after failed regen
How to Fix
When the DPF light shows, drive at a steady 40+ mph for ~20 minutes to allow passive/active regeneration before it fully blocks. If blocked, run a forced regeneration and diagnose the root cause: test the DPF pressure and EGT sensors, check EGR operation, and inspect for a leaking injector causing oil dilution. Clean or replace the DPF if soot loading is beyond limits, and change oil if fuel-diluted.
Sources for this issue (1)
P2002 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2002 mean on a Ford?
P2002 stands for "Diesel Particulate Filter Efficiency Below Threshold (Bank 1)." P2002 indicates that the diesel particulate filter (DPF) on bank 1 is performing below its required efficiency threshold. The DPF captures and stores soot from diesel exhaust and periodically burns it off (regeneration); the engine computer monitors exhaust pressure across the filter and other data to judge how well it's trapping and clearing soot. When that efficiency falls too low, this code sets. Symptoms can include reduced power, a clogged-filter warning, frequent or failed regenerations, and increased emissions. On Ford it is documented across 1 model: Fiesta.
What are the most common causes of P2002?
The most common causes of P2002 are: Clogged or damaged diesel particulate filter, Failed or incomplete DPF regeneration (mostly short trips), Faulty differential (DPF) pressure sensor or hoses, Faulty exhaust temperature sensor(s), Exhaust leak before or across the DPF, Engine running issues causing excess soot (injectors, EGR, turbo), Use of incorrect (non-low-ash) engine oil or fuel quality issues. The specific cause varies by vehicle.
How much does it cost to fix P2002 on a Ford?
Published repair estimates on Ford range from $400 to $2,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.