🚛 Volvo D12 & D13 Injector Codes. This D13 came in running rough on half its injectors. ⚡We repaired the ECM and the codes went inactive and engine ran smooth. The computer was the problem, not the injectors. 💻❌Before replacing injectors, make sure your ECM isn’t the issue 🔧👉Follow me for real diagnostics and proven solutions #VolvoTrucks #TruckMaintenance #DieselEngineRepair | Oscar Truck ECM

💨⛽ Volvo D13 Air-in-Fuel Test – Bad Injector Cups 🚛🛠️Our tech performed an air-in-fuel test on this Volvo D13 after hard-start and drivability complaints.🔎 The test showed excessive air in the fuel system, and further inspection confirmed the issue: failed injector cups.⚠️ Bad injector cups allow fuel and air to cross-contaminate, leading to: • Hard starts or no starts ❌ • Rough idle and poor performance • Fuel in coolant contamination risks✅ Replacing the injector cups resolves the leak pat