VW Golf 2.0 TDI EGR cooler bypass valve stuck fault
Engine management light with rough running and white smoke on cold start. The EGR cooler bypass valve on the 2.0 TDI (CFFB/CFGB) engine can stick in the open position, allowing hot uncooled exhaust gas into the intake manifold. This causes combustion temperature rise and can lead to premature injector wear. Cleaning or replacing the bypass valve and the EGR cooler resolves the fault. A high-quality EGR cooler from a reputable supplier is essential — cheap pattern parts fail rapidly.
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