Audi A3 8V 2.0 TDI: Intermittent 5V, Limp Mode

Hello,

"Our Audi A3 engine with code CRLB occasionally misfires under load and then frequently enters limp mode. Using an oscilloscope, I observed that the 5V supply, for example, to the crankshaft sensor, drops out for approximately 10ms at that moment. By externally powering various sensors with voltage, I have already ruled out the crankshaft, knock, manifold absolute pressure, exhaust gas recirculation, and fuel temperature sensors."

Im Fehlerspeicher steht auch was von Referenzenspannung 2/B. Welche Sensoren liegen da noch drauf? Über den Schaltplan bekommt man das meiner Meinung nach nicht raus. Who can help?

Best regards,

Daniel