Code
DF297
RENAULT
D
-> P2002 - Particle filter
Views:
UK: 5
EN: 9
RU: 5
AI status
Completed
Completed
100%
Causes
- Excessive soot loading in the DPF (blocked/clogged filter)
- Faulty or contaminated differential pressure (soot) sensor
- Faulty DPF inlet/outlet temperature sensor(s)
- Exhaust leaks upstream or around the DPF affecting sensor readings
- Failed or incomplete active regeneration (no or ineffective regen)
- Engine issues causing excess soot production (poor combustion, injector/turbo problems, EGR faults)
Symptoms
- Check engine light (MIL) illuminated with DF297 / P2002
- Reduced engine performance or de-rate (limp mode) during/after fault
- Frequent or failed forced regeneration attempts
- Increased fuel consumption
- Strong diesel smoke (especially during acceleration) or unusual exhaust odor
- Unusual exhaust noises if backpressure is high
What to check
- Read and record all stored DTCs and freeze-frame data from the ECU
- Check live data: DPF differential pressure, DPF inlet/outlet temps, soot mass if available
- Inspect wiring and connectors for differential pressure and temp sensors for corrosion or damage
- Visually inspect exhaust for leaks upstream of the DPF and at flange joints
- Review vehicle service history for recent regen attempts and driving pattern
- Perform smoke/leak test on intake and exhaust if abnormal sensor readings are present
Signal parameters
- DPF differential pressure (kPa or mbar) — compare at idle and under load
- DPF inlet (upstream) temperature (°C) and DPF outlet (downstream) temperature (°C)
- Soot mass or accumulation value (grams) if supported
- Engine RPM and load (%) during readings
- Mass air flow (MAF) and turbo boost pressure
- Fuel rail/pressure and injector status (pulse width)
Diagnostic algorithm
- Connect a compatible diagnostic tool. Read and record DF297, P2002 and any other DTCs plus freeze-frame data.
- Check for related codes (injectors, turbo, MAF, EGR, temperature sensors). Address those first if present.
- Inspect wiring and connectors for DPF differential pressure and temperature sensors. Repair any damage or corrosion.
- Monitor live data: note differential pressure and DPF temps at cold idle, hot idle, and under steady road load. Compare against manufacturer limits.
- Check for exhaust leaks upstream of the DPF and repair as needed. Leaks can invalidate sensor readings.
- Verify recent regeneration history and attempt a controlled/forced regeneration per manufacturer procedure if safe to do so. Monitor temperatures and differential pressure during regen.
- If forced regen does not reduce soot load or differential pressure remains high, consider removing DPF for inspection (visual check for ash, oil contamination, physical damage).
- If DPF is heavily loaded with soot and cannot be regenerated, arrange professional cleaning or replacement. Replace sensors found faulty.
- After repairs or cleaning, clear codes and perform road test/regeneration cycle. Re-scan for returning faults and verify normal live data values.
- If problem persists with normal sensor signals, investigate engine combustion issues (injectors, turbocharger, fuel pressure, EGR) and update ECU software if an applicable service action exists.
Likely causes
- High soot accumulation due to short-trip driving or failed regenerations
- Differential pressure sensor reading out of range or intermittent
- Blocked/partially blocked DPF requiring cleaning or replacement
- Exhaust leak upstream of sensors causing incorrect pressure/temperature readings
- Turbocharger or fuel system fault producing excess particulates
Fault status
Status
DF297 — Particle filter efficiency below threshold (linked to P2002). Possible soot accumulation, sensor fault, exhaust leak, or combustion-related soot generation.
Repair difficulty: Hard
Diagnostic time: 1-4 hours
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