2026-10-08 · 5 min read
Nissan Navara NOx / EGR Sensor Malaysia — YD25 Diesel
Diesel engines do not use traditional oxygen (O2) sensors for stoichiometric control like petrol engines. YD25DDTi uses a differential pressure sensor for DPF monitoring (if equipped) and EGR position/flow sensors. A faulty EGR differential pressure sensor commonly triggers P0400 codes. Some variants have a NOx sensor. Diagnosis requires a diesel-capable scanner with live data.
Navara Oxygen Sensor
- Upstream and downstream O2 sensors control fuel trim — replace if reading erratically
- Typical lifespan: 80,000–120,000 km
- Use Denso or NGK OEM-spec replacement sensors
- Bad O2 sensor: rich running, high fuel consumption, occasional misfires, CEL P0130–P0167