The hydraulic timing chain tensioner often fails to maintain proper tension, especially when oil pressure is low or oil quality has degraded.
Periodic manual cleaning, such as walnut blasting or specialized chemical intake cleaning, is typically required every 50,000–60,000 km. 3. High-Pressure Fuel Pump (HPFP) Failure
As a direct-injection engine, fuel is sprayed directly into the combustion chamber, bypassing the intake valves.