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P0641 code is showing on my 2009 Audi A3, does anyone know how to fix this?

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the sensors have all been checked and this is not the problem, the wiring has also been checked. if anyone kows of anything else that could be causing the problem, please can you help

Vehicle: Audi A3 Sline Sp edition 2009 1.8 TFSI

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P0641 Sensor reference voltage "A" circuit open

The only solution for this is to replace the ECM.

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