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In Audi A6 2.0 TDI and 1.9 TDI engines, it is a common situation for a cold engine to start without problems, but when the engine warms up, it does not start or starts late. In this video, we discuss the possible causes of this problem and their solutions in detail. Possible Causes: Fuel System Problems: Clogging of the injectors or irregular fuel injection amount can cause a hot engine to start late. Ignition System Problems: Overheating of the spark plugs or spark plug wires can cause weak spark production on a hot engine. Sensor Failures: In particular, a malfunction of the engine coolant temperature sensor (temperature sensor) can incorrectly perceive the engine temperature and disrupt the fuel-air mixture. Starter Motor Problems: Excessive current draw or poor operation of the starter motor on a hot engine can cause the engine to start late. Air Leaks: Air leaks in the intake manifold or vacuum hoses can increase with temperature and make it difficult for the engine to start. Solution Suggestions: Diagnostic Check: Determine the source of the problem by scanning the error codes in the engine control unit (ECU). Fuel System Test: Check the injectors and fuel pressure regulator. Ignition Elements Check: Examine the spark plug, spark plug wires and coil. Sensor Test: Make sure that the temperature sensor is working properly. Air Leak Test: Check for leaks in the vacuum hoses and intake manifold. Starter Motor and Battery Check: Test the electrical system and starter motor under temperature. These steps can help solve problems with hot engines not starting. You can watch our video for more information and detailed explanations.