Nissan Navara D40

2.5L four-cylinder turbodiesel for commercial vehicles. Powerful, but timing chain and turbo can cause issues.

• !! Simplex timing chain breaks/stretches from 140,000 km

  The lower timing chain was reduced from duplex to simplex while engine output increased by 50%, leading to premature stretch and in the worst case chain breakage. Upgrade to duplex chain is possible (Billcarengineering).

  Symptoms: Rattling and metallic ticking near the high-pressure pump/crankshaft area, engine warning light, poor cold start
  800–1,500 $
  Ad Timing chain YD25DDTi Navara D40Duplex timing chain YD25 BillcarengineeringTiming chain tensioner YD25DDTi Pathfinder
• !! Turbocharger bearing wear from 160,000 km

  The YD25DDTi turbocharger tends to develop bearing wear at high mileage or with neglected oil changes. Severe turbo damage can cause secondary engine damage.

  Symptoms: Whistling noise from turbo, blue smoke, power loss, oil in intercooler
  800–2,500 $
  Ad Turbocharger YD25DDTi Navara D40Turbo rebuild YD25 Pathfinder
• !! EGR cooler leaking / coolant loss from 120,000 km

  The YD25DDTi EGR cooler can develop leaks and allow coolant into the intake tract. Coolant loss without visible external leak is a typical symptom. If left untreated, overheating and engine damage follow.

  Symptoms: Slow coolant loss, white smoke under acceleration, sweet smell in engine bay
  500–1,500 $
  Ad EGR cooler YD25DDTi NavaraEGR cooler YD25 Pathfinder R51