Code
DF1196
RENAULT
D
-> P047B - relative pressure sensor particulate filter
Views:
UK: 3
EN: 8
RU: 1
AI status
Completed
Completed
100%
Causes
- Faulty DPF relative/differential pressure sensor
- Damaged wiring or poor electrical connection at sensor/ECU
- Blocked/clogged DPF or excessive soot load causing abnormal pressures
- Leak or restriction in sensor tubing/hoses or exhaust leaks upstream of sensor
- Corroded connector or water ingress into sensor/pigtail
- Intermittent ECU or software error
Symptoms
- Malfunction Indicator Lamp (MIL) / check engine light on
- Reduced engine performance or derate / limp mode on some vehicles
- DPF regeneration failures or frequent forced regens
- Increased fuel consumption and visible smoke under load
- Stored DPF-related fault codes and inability to complete regen
What to check
- Read and record freeze-frame and stored codes with a capable scanner (confirm DF1196 / P047B)
- Check live data: DPF differential pressure sensor value at idle and under load; compare with expected behavior while revving/road test
- Visually inspect sensor, connector and wiring for damage, corrosion or water ingress
- Inspect and replace/clear any flexible pressure/vacuum hoses between DPF and sensor; ensure no kinks or blockages
- Smoke-test intake/exhaust and sensor hoses for leaks
- Measure sensor supply voltage and ground at connector (typically +5V reference) and back-probe signal while operating
Signal parameters
- Typical supply: approx. 5 V reference (verify vehicle-specific)
- Typical signal output: ~0.5–4.5 V across the sensor operating range (0 mbar → low voltage; increasing pressure → higher voltage)
- At cold idle with clean DPF: signal near low end (small differential pressure) — often
- Under load or blocked DPF: signal should rise smoothly with engine load; abrupt jumps, pegged low/high or no change indicate fault
- Resistance values are manufacturer-specific — bench test using specified pressure sweep is recommended
Diagnostic algorithm
- Connect diagnostic scanner, confirm DF1196 / P047B and read freeze frame and live sensor data.
- With ignition on, verify sensor supply voltage and ground at sensor connector. If no correct supply or ground, repair wiring/ECU circuit.
- Back-probe the signal wire and monitor live volts while increasing engine speed. Observe smooth, proportional change in voltage. If signal stuck or erratic, suspect sensor or wiring.
- Inspect and replace any short/blocked/crushed pressure hoses between DPF and sensor. Smoke-test hoses for leaks.
- Visually inspect and clean connector; check for corrosion. Wiggle-test wiring to reproduce intermittent faults.
- If wiring and harness pass, remove sensor and bench-test using a calibrated pressure source or replace with a known-good sensor.
- If sensor is good but high differential pressure persists, measure DPF backpressure directly; clean, regenerate or replace DPF if excessively blocked.
- After repair, clear codes and perform road test / forced regen as required to verify code does not return.
- If fault persists with correct sensor and intact hoses, consider ECU diagnostics, reflash or replacement per manufacturer guidance.
Likely causes
- Open/short in sensor signal or supply wire
- Contaminated/clogged DPF causing higher-than-expected differential pressure
- Crushed/blocked vacuum/pressure hose between sensor and DPF
- Failed pressure sensor (internal electronics)
- Corroded connector pins or poor ground
Fault status
Status
DF1196 / P047B — Relative (differential) pressure sensor for particulate filter: signal/range/performance fault (check sensor, hoses, wiring, DPF restriction).
Repair difficulty: Medium
Diagnostic time: 0.5–2.5 hours
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