Can somebody help me please. So I have a audi a4 b8 avant 3.0 tdi 176 kw. The issue I have is that when you put ignition on intermittenly radiator fan kicks on, esp light comes on aswell ass park brake and tpms and engine ecu light dissappears. In all the other modules i get the fault code 0522 engine control unit no signal. And when you press the clutch pedal and start the car it starts normally and nothing happens while driving. Only with ignition on. I can communicate to the enginu ecu while the car is started or when I cycle through ignition the engine light appears appears normally without faults with ignition on. I tried to replace the 643 engine ecu relay with an aftermaeket one from bosch. It was good for one afternoon. Then i replaced that with the used one 643. It was good the evening. And in the morning it was also good. Then customer drove for 300 km. Switched the car off and pressed ignition on again and all the lights appeared again. Last evening when putting the used relay i tried to press in the pins on the connector, they looked clean. Is it possible that they spread during driving and bumping and there is just a bad contact on start up? The vin number is WAUZZZ8K0AA144342.

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