Leaks in the turbocharging system
Check air hose between turbocharger and fuel line (collector) through the charge air cooler for breaks, cracks, loose connections, etc. and eliminate them if found.
Check for leaks between cylinder head and intake manifold. This can be due to defective gaskets or, in some cases, due to misalignment of the manifold.
Leaks can be in the connecting flanges between the exhaust manifold and cylinder head or between the exhaust manifold and the turbocharger.
Faulty turbocharger
Check the boost pressure in the workshop. It can be either too high or too low.
If the pressure is too high, the cause may be a faulty boost pressure control solenoid valve or a faulty boost chamber in the boost pressure control valve. Reading the memory of the diagnostic device in the workshop will help determine where the fault is.
If the pressure is too low, then the charge chamber of the boost pressure control device can be suspected. Otherwise, the turbocharger must be faulty.
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